Gottlob Frege

Short description: German philosopher, logician, and mathematician (1848–1925)

"Frege" redirects here. For other people with the surname, see Frege (surname).

Not to be confused with Gottlob Frick.

Gottlob Frege

Frege c. 1879

Born|

Friedrich Ludwig Gottlob Frege

8 November 1848

Wismar, Grand Duchy of Mecklenburg-Schwerin, German Confederation

Died| 26 July 1925(1925-07-26) (aged 76)

Bad Kleinen, Free State of Mecklenburg-Schwerin, German Republic

Education| University of Göttingen (PhD, 1873)
University of Jena (Dr. phil. hab., 1874)

Notable work

| Begriffsschrift (1879)
The Foundations of Arithmetic (1884)
Basic Laws of Arithmetic (1893–1903)
Era| 19th-/20th-century philosophy
Region| Western philosophy
School| Analytic philosophy
Linguistic turn
Logical realism
Modern Platonism[1]
Logicism
Transcendental idealism[2][3] (before 1891)
Metaphysical realism[3] (after 1891)
Foundationalism[4]
Indirect realism[5]
Redundancy theory of truth[6]
Institutions| University of Jena
Theses|

* On a Geometrical Representation of Imaginary Forms in a Plane (1873)
* Methods of Calculation based on an Extension of the Concept of Magnitude (1874)

Doctoral advisor| Ernst Christian Julius Schering (PhD advisor)
Other academic advisors| Ernst Abbe
Alfred Clebsch
Kuno Fischer
Hermann Lotze
Eduard Riecke
Wilhelm Eduard Weber
Notable students| Rudolf Carnap

Main interests

| Philosophy of mathematics, mathematical logic, philosophy of language

Notable ideas

* Analytic philosophy
* Ancestral relation
* Anti-psychologism
* Basic law V
* Concept and object
* Context principle
* Currying
* Descriptivist theory of names
* Frege's principle
* Frege's puzzles
* Frege's theorem
* Fregean analysis
* Frege–Church ontology
* Frege–Geach problem
* Frege–Russell logic
* Function and Concept
* Law of trichotomy
* Logicism
* Hume's principle
* Mediated reference theory
* Naive set theory
* Named set theory
* Predicate calculus
* Propositional calculus
* Principle of compositionality
* Quantification theory
* Redundancy theory of truth
* Round square copula
* Second-order logic
* Sense and reference
* Set-theoretic definition of natural numbers
* Sortal
* Third realm

Friedrich Ludwig Gottlob Frege (/ˈfreɪɡə/;[7] de; 8 November 1848 – 26 July 1925) was a German philosopher, logician, and mathematician. He was a mathematics professor at the University of Jena, and is understood by many to be the father of analytic philosophy, concentrating on the philosophy of language, logic, and mathematics. Though he was largely ignored during his lifetime, Giuseppe Peano (1858–1932), Bertrand Russell (1872–1970), and, to some extent, Ludwig Wittgenstein (1889–1951) introduced his work to later generations of philosophers. Frege is widely considered to be one of the greatest logicians since Aristotle, and one of the most profound philosophers of mathematics ever.[8]

His contributions include the development of modern logic in the Begriffsschrift and work in the foundations of mathematics. His book the Foundations of Arithmetic is the seminal text of the logicist project, and is cited by Michael Dummett as where to pinpoint the linguistic turn. His philosophical papers "On Sense and Reference" and "The Thought" are also widely cited. The former argues for two different types of meaning and descriptivism. In Foundations and "The Thought", Frege argues for Platonism against psychologism or formalism, concerning numbers and propositions respectively.

## Contents

* 1 Life
* 1.1 Childhood (1848–1869)
* 1.2 Studies at University (1869–1874)
* 2 Work as a logician
* 3 Philosopher
* 4 Examples
* 5 See also
* 6 References
* 7 External links
* 8 Sense and reference
* 9 Political and social views
* 10 Personality
* 11 Important dates
* 12 Important works
* 12.1 Logic, foundation of arithmetic
* 12.2 Philosophical studies
* 12.3 Articles on geometry
* 13 See also
* 14 Notes
* 15 References
* 16 Sources
* 16.1 Primary
* 16.2 Secondary
* 17 External links

## Life

### Childhood (1848–1869)

Frege was born in 1848 in Wismar, Mecklenburg-Schwerin (today part of Mecklenburg-Vorpommern in northern Germany). His father, Carl (Karl) Alexander Frege (1809–1866), was the co-founder and headmaster of a girls' high school until his death. After Carl's death, the school was led by Frege's mother Auguste Wilhelmine Sophie Frege (née Bialloblotzky, 12 January 1815 – 14 October 1898); her mother was Auguste Amalia Maria Ballhorn, a descendant of Philipp Melanchthon[9] and her father was Johann Heinrich Siegfried Bialloblotzky. Frege was a Lutheran.[10]

In childhood, Frege encountered philosophies that would guide his future scientific career. For example, his father wrote a textbook on the German language for children aged 9–13, entitled Hülfsbuch zum Unterrichte in der deutschen Sprache für Kinder von 9 bis 13 Jahren (2nd ed., Wismar 1850; 3rd ed., Wismar and Ludwigslust: Hinstorff, 1862) (Help book for teaching German to children from 9 to 13 years old), the first section of which dealt with the structure and logic of language.

Frege studied at Große Stadtschule Wismar [de; de] and graduated in 1869.[11] Teacher of mathematics and natural science Gustav Adolf Leo Sachse (1843–1909), who was also a poet, played an important role in determining Frege's future scientific career, encouraging him to continue his studies at his own alma mater the University of Jena.[12]

### Studies at University (1869–1874)

Frege matriculated at the University of Jena in the spring of 1869 as a citizen of the North German Confederation. In the four semesters of his studies, he attended approximately twenty courses of lectures, most of them on mathematics and physics. His most important teacher was Ernst Karl Abbe (1840–1905; physicist, mathematician, and inventor). Abbe gave lectures on theory of gravity, galvanism and electrodynamics, complex analysis theory of functions of a complex variable, applications of physics, selected divisions of mechanics, and mechanics of solids. Abbe was more than a teacher to Frege: he was a trusted friend, and, as director of the optical manufacturer Carl Zeiss AG, he was in a position to advance Frege's career. After Frege's graduation, they came into closer correspondence.[citation needed]

His other notable university teachers were Christian Philipp Karl Snell (1806–1886; subjects: use of infinitesimal analysis in geometry, analytic geometry of planes, analytical mechanics, optics, physical foundations of mechanics); Hermann Karl Julius Traugott Schaeffer (1824–1900; analytic geometry, applied physics, algebraic analysis, on the telegraph and other electronic machines); and the philosopher Kuno Fischer (1824–1907; Kantian and critical philosophy).[13]

Starting in 1871, Frege continued his studies in Göttingen, the leading university in mathematics in German-speaking territories, where he attended the lectures of Alfred Clebsch (1833–1872; analytic geometry), Ernst Christian Julius Schering (1824–1897; function theory), Wilhelm Eduard Weber (1804–1891; physical studies, applied physics),[14] Eduard Riecke (1845–1915; theory of electricity), and Hermann Lotze (1817–1881; philosophy of religion).[14] Many of the philosophical doctrines of the mature Frege have parallels in Lotze. It has been the subject of scholarly debate whether or not Lotze's philosophy had a direct influence on Frege's views.[15]

In 1873, Frege attained his doctorate under Schering.

Frege married Margarete Katharina Sophia Anna Lieseberg (15 February 1856 – 25 June 1904) on 14 March 1887.[11] The couple had at least two children, who died when young. Years later, they adopted a son, Alfred. Little else is known about Frege's family life, however.[16]

Frege's house at Forstweg 29 in Jena, shared with his neighbor Rudolf Hirzel

## Work as a logician

Main article: Begriffsschrift

Though his education and early mathematical work focused primarily on geometry, Frege's work soon turned to logic. His  Begriffsschrift, eine der arithmetischen nachgebildete Formelsprache des reinen Denkens, Halle a/S: Verlag von Louis Nebert, 1879 marked a turning point in the history of logic. The Begriffsschrift broke new ground, including a rigorous treatment of the ideas of functions and variables. Frege's goal was to show that mathematics grows out of logic, and in so doing, he devised techniques that separated him from the Aristotelian syllogistic but took him rather close to Stoic propositional logic.[17]

Title page to Begriffsschrift (1879)

In effect, Frege invented axiomatic predicate logic, in large part thanks to his invention of quantified variables, which eventually became ubiquitous in mathematics and logic, and which solved the problem of multiple generality. Previous logic had dealt with the logical constants and, or, if... then..., not, and some and all, but iterations of these operations, especially "some" and "all", were little understood: even the distinction between a sentence like "every boy loves some girl" and "some girl is loved by every boy" could be represented only very artificially, whereas Frege's formalism had no difficulty expressing the different readings of "every boy loves some girl who loves some boy who loves some girl" and similar sentences, in complete parallel with his treatment of, say, "every boy is foolish".

A frequently noted example is that Aristotle's logic is unable to represent mathematical statements like Euclid's theorem, a fundamental statement of number theory that there are an infinite number of prime numbers. Frege's "conceptual notation", however, can represent such inferences.[18] The analysis of logical concepts and the machinery of formalization that is essential to Principia Mathematica (3 vols., 1910–1913, by Bertrand Russell, 1872–1970, and Alfred North Whitehead, 1861–1947), to Russell's theory of descriptions, to Kurt Gödel's (1906–1978) incompleteness theorems, and to Alfred Tarski's (1901–1983) theory of truth, is ultimately due to Frege.

One of Frege's stated purposes was to isolate genuinely logical principles of inference, so that in the proper representation of mathematical proof, one would at no point appeal to "intuition". If there was an intuitive element, it was to be isolated and represented separately as an axiom: from there on, the proof was to be purely logical and without gaps. Having exhibited this possibility, Frege's larger purpose was to defend the view that arithmetic is a branch of logic, a view known as logicism: unlike geometry, arithmetic was to be shown to have no basis in "intuition", and no need for non-logical axioms. Already in the 1879 Begriffsschrift important preliminary theorems, for example, a generalized form of law of trichotomy, were derived within what Frege understood to be pure logic.

This idea was formulated in non-symbolic terms in his The Foundations of Arithmetic (Die Grundlagen der Arithmetik, 1884). Later, in his Basic Laws of Arithmetic (Grundgesetze der Arithmetik, vol. 1, 1893; vol. 2, 1903; vol. 2 was published at his own expense), Frege attempted to derive, by use of his symbolism, all of the laws of arithmetic from axioms he asserted as logical. Most of these axioms were carried over from his Begriffsschrift, though not without some significant changes. The one truly new principle was one he called the Basic Law V: the "value-range" of the function f(x) is the same as the "value-range" of the function g(x) if and only if ∀x[f(x) = g(x)].

The crucial case of the law may be formulated in modern notation as follows. Let {x|Fx} denote the extension of the predicate Fx, that is, the set of all Fs, and similarly for Gx. Then Basic Law V says that the predicates Fx and Gx have the same extension if and only if ∀x[Fx ↔ Gx]. The set of Fs is the same as the set of Gs just in case every F is a G and every G is an F. (The case is special because what is here being called the extension of a predicate, or a set, is only one type of "value-range" of a function.)

In a famous episode, Bertrand Russell wrote to Frege, just as Vol. 2 of the Grundgesetze was about to go to press in 1903, showing that Russell's paradox could be derived from Frege's Basic Law V. It is easy to define the relation of membership of a set or extension in Frege's system; Russell then drew attention to "the set of things x that are such that x is not a member of x". The system of the Grundgesetze entails that the set thus characterised both is and is not a member of itself, and is thus inconsistent. Frege wrote a hasty, last-minute Appendix to Vol. 2, deriving the contradiction and proposing to eliminate it by modifying Basic Law V. Frege opened the Appendix with the exceptionally honest comment: "Hardly anything more unfortunate can befall a scientific writer than to have one of the foundations of his edifice shaken after the work is finished. This was the position I was placed in by a letter of Mr. Bertrand Russell, just when the printing of this volume was nearing its completion." (This letter and Frege's reply are translated in Jean van Heijenoort 1967.)

Frege's proposed remedy was subsequently shown to imply that there is but one object in the universe of discourse, and hence is worthless (indeed, this would make for a contradiction in Frege's system if he had axiomatized the idea, fundamental to his discussion, that the True and the False are distinct objects; see, for example, Dummett 1973), but recent work has shown that much of the program of the Grundgesetze might be salvaged in other ways:

* Basic Law V can be weakened in other ways. The best-known way is due to philosopher and mathematical logician George Boolos (1940–1996), who was an expert on the work of Frege. A "concept" F is "small" if the objects falling under F cannot be put into one-to-one correspondence with the universe of discourse, that is, unless: ∃R[R is 1-to-1 & ∀x∃y(xRy & Fy)]. Now weaken V to V*: a "concept" F and a "concept" G have the same "extension" if and only if neither F nor G is small or ∀x(Fx ↔ Gx). V* is consistent if second-order arithmetic is, and suffices to prove the axioms of second-order arithmetic.
* Basic Law V can simply be replaced with Hume's principle, which says that the number of Fs is the same as the number of Gs if and only if the Fs can be put into a one-to-one correspondence with the Gs. This principle, too, is consistent if second-order arithmetic is, and suffices to prove the axioms of second-order arithmetic. This result is termed Frege's theorem because it was noticed that in developing arithmetic, Frege's use of Basic Law V is restricted to a proof of Hume's principle; it is from this, in turn, that arithmetical principles are derived. On Hume's principle and Frege's theorem, see "Frege's Logic, Theorem, and Foundations for Arithmetic".[19]
* Frege's logic, now known as second-order logic, can be weakened to so-called predicative second-order logic. Predicative second-order logic plus Basic Law V is provably consistent by finitistic or constructive methods, but it can interpret only very weak fragments of arithmetic.[20]

Frege's work in logic had little international attention until 1903, when Russell wrote an appendix to The Principles of Mathematics stating his differences with Frege. The diagrammatic notation that Frege used had no antecedents (and has had no imitators since). Moreover, until Russell and Whitehead's Principia Mathematica (3 vols.) appeared in 1910–1913, the dominant approach to mathematical logic was still that of George Boole (1815–1864) and his intellectual descendants, especially Ernst Schröder (1841–1902). Frege's logical ideas nevertheless spread through the writings of his student Rudolf Carnap (1891–1970) and other admirers, particularly Bertrand Russell[21]: 2 and Ludwig Wittgenstein (1889–1951).[22]: 357

## Philosopher

Circa (disambiguation)}}Template:TWCleanup2Circa (from la 'around, about, roughly, approximately') - frequently abbreviated ca. or c. and less frequently circ., cca. or cc. - signifies "approximately" in several European languages and is used as a loanword in English, usually in reference to a date.[23] Circa is widely used in historical writing when the dates of events are not accurately known. When used in date ranges, circa is applied before each approximate date, while dates without circa immediately preceding them are generally assumed to be known with certainty.

## Examples

*1732–1799: Both years are known precisely. *c. 1732 – 1799: The beginning year is approximate; the end year is known precisely. *1732 – c. 1799: The beginning year is known precisely; the end year is approximate. *c. 1732 – c. 1799: Both years are approximate.

## See also

*Floruit

## References

1. ↑ Balaguer, Mark (25 July 2016). Zalta, Edward N.. ed. Platonism in Metaphysics. Metaphysics Research Lab, Stanford University. https://plato.stanford.edu/archives/spr2016/entries/platonism/.
2. ↑ Hans Sluga, "Frege's alleged realism," Inquiry 20 (1–4):227–242 (1977).
3. ↑ 3.0 3.1 Michael Resnik, II. Frege as Idealist and then Realist," Inquiry 22 (1–4):350–357 (1979).
4. ↑ Tom Rockmore, On Foundationalism: A Strategy for Metaphysical Realism, Rowman & Littlefield, 2004, p. 111.
5. ↑ Frege criticized direct realism about propositional content in his "Über Sinn und Bedeutung" (see Samuel Lebens, Bertrand Russell and the Nature of Propositions: A History and Defence of the Multiple Relation Theory of Judgement, Routledge, 2017, p. 34).
6. ↑ Truth – Internet Encyclopedia of Philosophy; The Deflationary Theory of Truth (Stanford Encyclopedia of Philosophy).
7. ↑ "Frege". Random House Webster's Unabridged Dictionary.
8. ↑ Wehmeier, Kai F. (2006). "Frege, Gottlob". in Borchert, Donald M.. Encyclopedia of Philosophy. 3 (2 ed.). Macmillan Reference USA. ISBN 0-02-866072-2.
9. ↑ Lothar Kreiser, Gottlob Frege: Leben – Werk – Zeit, Felix Meiner Verlag, 2013, p. 11.
10. ↑ Jacquette, Dale (4 April 2019). Frege: A Philosophical Biography. Cambridge University Press. ISBN 9780521863278. https://books.google.com/books?id=hwiKDwAAQBAJ&dq=gottlob+frege+lutheran&pg=PA73.
11. ↑ 11.0 11.1 Jacquette, Dale, Frege: A Philosophical Biography, Cambridge University Press, 2019, p. xiii.
12. ↑ Jacquette, Dale (2019-04-04). "2 - Education through University Days (1854–1874)". Frege: A Philosophical Biography (1 ed.). Cambridge University Press. pp. 37, 42. doi:10.1017/9781139033725.005. ISBN 978-1-139-03372-5. https://www.cambridge.org/core/product/identifier/9781139033725/type/book.
13. ↑ (in en) The Philosophy of Gottlob Frege. Cambridge University Press. https://assets.cambridge.org/052183/6697/excerpt/0521836697_excerpt.htm.
14. ↑ 14.0 14.1 Jacquette, Dale, Frege: A Philosophical Biography, Cambridge University Press, 2019, p. 64.
15. ↑ Gabriel, Gottfried (2026). "Hermann Lotze's Philosophy of Language and Its Influence on Frege". in Vagnetti, Michele; Milkov, Nikolay (in English). The Philosophy of Rudolph Hermann Lotze: A Reassessment. United Kingdom: Taylor & Francis. doi:10.4324/9781003521198-12. ISBN 9781040644027.
16. ↑ "Frege, Gottlob | Internet Encyclopedia of Philosophy". https://iep.utm.edu/frege/.
17. ↑ Susanne Bobzien published in 2021 a work provocatively titled "Frege plagiarized the Stoics": Bobzien S., – In: Themes in Plato, Aristotle, and Hellenistic Philosophy, Keeling Lectures 2011–2018, p.149-206; Zalta, Ed, Frege, Stanford Encyclopedia of Philosophy
18. ↑ Horsten, Leon and Pettigrew, Richard, "Introduction" in The Continuum Companion to Philosophical Logic (Continuum International Publishing Group, 2011), p. 7.
19. ↑ Frege's Logic, Theorem, and Foundations for Arithmetic, Stanford Encyclopedia of Philosophy at plato.stanford.edu
20. ↑ Burgess, John (2005). Fixing Frege. Princeton University Press. ISBN 978-0-691-12231-1.
21. ↑ Klement, Kevin C. (June 17, 2023). "Peano, Frege, and Russell's Logical Influences". https://philarchive.org/archive/KLEPFA-3.
22. ↑ Tyler Burge (2013). "Chapter 10: Gottlob Frege: Some forms of influence". in Beaney, Michael. The Oxford Handbook of The History of Analytic Philosophy. Oxford, England: Oxford University Press. pp. 355–382. https://philosophy.ucla.edu/wp-content/uploads/2018/08/Burge-2013-Frege-Some-Forms-of-Influence.pdf. Retrieved April 26, 2025.
23. ↑ "circa". Dictionary.com. http://dictionary.reference.com/browse/circa.

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Frege is one of the founders of analytic philosophy, whose work on logic and language gave rise to the linguistic turn in philosophy. His contributions to the philosophy of language include:

* Function and argument analysis of the proposition;
* Distinction between concept and object (Begriff und Gegenstand);
* Principle of compositionality;
* Context principle; and
* Distinction between the sense and reference (Sinn und Bedeutung) of names and other expressions, sometimes said to involve a mediated reference theory.

As a philosopher of mathematics, Frege attacked the psychologistic appeal to mental explanations of the content of judgment of the meaning of sentences. His original purpose was very far from answering general questions about meaning; instead, he devised his logic to explore the foundations of arithmetic, undertaking to answer questions such as "What is a number?" or "What objects do number-words ('one', 'two', etc.) refer to?" But in pursuing these matters, he eventually found himself analysing and explaining what meaning is, and thus came to several conclusions that proved highly consequential for the subsequent course of analytic philosophy and the philosophy of language.

## Sense and reference

Main article: Philosophy:Sense and reference

Frege's 1892 paper, "On Sense and Reference" ("Über Sinn und Bedeutung"), introduced his influential distinction between sense ("Sinn") and reference ("Bedeutung", which has also been translated as "meaning", or "denotation"). While conventional accounts of meaning took expressions to have just one feature (reference), Frege introduced the view that expressions have two different aspects of significance: their sense and their reference.

Reference (or "Bedeutung") applied to proper names, where a given expression (say the expression "Tom") simply refers to the entity bearing the name (the person named Tom). Frege also held that propositions had a referential relationship with their truth-value (in other words, a statement "refers" to the truth-value it takes). By contrast, the sense (or "Sinn") associated with a complete sentence is the thought it expresses. The sense of an expression is said to be the "mode of presentation" of the item referred to, and there can be multiple modes of representation for the same referent.

The distinction can be illustrated thus: In their ordinary uses, the name "Charles Philip Arthur George Mountbatten-Windsor", which for logical purposes is an unanalysable whole, and the functional expression "the King of the United Kingdom", which contains the significant parts "the King of ξ" and "United Kingdom", have the same referent, namely, the person best known as King Charles III. But the sense of the word "United Kingdom" is a part of the sense of the latter expression, but no part of the sense of the "full name" of King Charles.

These distinctions were disputed by Bertrand Russell, especially in his paper "On Denoting"; the controversy has continued into the present, fueled especially by Saul Kripke's famous lectures "Naming and Necessity".

## Political and social views

In 1954, Dummett studied the transcriptions of Frege's Nachlass that had survived the Second World War, including fragments of a 1924 diary.[1][2] Dummett, an anti-racism activist as well as a Frege scholar, later recounted how he had been deeply shocked to discover from this that the man he had "revered" as "an absolutely rational man" was at the end of his life, according to Dummett, a 'virulent anti-Semite' of "extreme right-wing opinions".[3][4]

The diary fragments were finally published in 1994.[5] with an English translation following in 1996.[6] Written in the last year of his life, at the age of 76, it contains opposition to the parliamentary system, universal suffrage, democrats, socialism and liberals, and hostility toward Catholics and the French as well as the Jews.[7] Frege thought Jews ought at least be deprived of certain political rights.[8] And, although he had held friendly relations with Jews in real life (among his students was Gershom Scholem who greatly valued his teaching), Frege wrote that it would be best if Jews would "get lost, or better would like to disappear from Germany."[9]

Frege confided "that he had once thought of himself as a liberal and was an admirer of Bismarck", but then sympathized with General Ludendorff. In an entry dated 5 May 1924 Frege expressed some agreement with an article published in Houston Stewart Chamberlain's Deutschlands Erneuerung which praised Adolf Hitler.[9] Some interpretations have been written about that time.[10]

## Personality

Frege was described by his students as a highly introverted person, seldom entering into dialogues with others and mostly facing the blackboard while lecturing. He was, however, known to occasionally show wit and even bitter sarcasm during his classes.[11]

## Important dates

* Born 8 November 1848 in Wismar, Mecklenburg-Schwerin.
* 1869 — attends the University of Jena.
* 1871 — attends the University of Göttingen.
* 1873 — PhD, doctor in mathematics (geometry), attained at Göttingen.[lower-alpha 1]
* 1874 — Habilitation at Jena;[lower-alpha 2] private teacher.
* 1879 — Ausserordentlicher Professor at Jena.
* 1896 — Ordentlicher Honorarprofessor at Jena.
* 1918 — retires.[12]
* Died 26 July 1925 in Bad Kleinen (now part of Mecklenburg-Vorpommern).

## Important works

### Logic, foundation of arithmetic

Begriffsschrift: eine der arithmetischen nachgebildete Formelsprache des reinen Denkens (1879), Halle an der Saale: Verlag von Louis Nebert (online version).

* In English: Begriffsschrift, a Formula Language, Modeled Upon That of Arithmetic, for Pure Thought, in: J. van Heijenoort (ed.), From Frege to Gödel: A Source Book in Mathematical Logic, 1879–1931, Harvard, MA: Harvard University Press, 1967, pp. 5–82.
* In English (selected sections revised in modern formal notation): R. L. Mendelsohn, The Philosophy of Gottlob Frege, Cambridge: Cambridge University Press, 2005: "Appendix A. Begriffsschrift in Modern Notation: (1) to (51)" and "Appendix B. Begriffsschrift in Modern Notation: (52) to (68)."[lower-alpha 3]

Die Grundlagen der Arithmetik: Eine logisch-mathematische Untersuchung über den Begriff der Zahl (1884), Breslau: Verlag von Wilhelm Koebner (online version).

* In English: The Foundations of Arithmetic: A Logico-Mathematical Enquiry into the Concept of Number, translated by J. L. Austin, Oxford: Basil Blackwell, 1950.

Grundgesetze der Arithmetik, Band I (1893); Band II (1903), Jena: Verlag Hermann Pohle (online version).

* In English (translation of selected sections), "Translation of Part of Frege's Grundgesetze der Arithmetik," translated and edited Peter Geach and Max Black in Translations from the Philosophical Writings of Gottlob Frege, New York, NY: Philosophical Library, 1952, pp. 137–158.
* In German (revised in modern formal notation): Grundgesetze der Arithmetik, Korpora (portal of the University of Duisburg-Essen), 2006: Band I and Band II .
* In German (revised in modern formal notation): Grundgesetze der Arithmetik – Begriffsschriftlich abgeleitet. Band I und II: In moderne Formelnotation transkribiert und mit einem ausführlichen Sachregister versehen, edited by T. Müller, B. Schröder, and R. Stuhlmann-Laeisz, Paderborn: mentis, 2009.
* In English: Basic Laws of Arithmetic, translated and edited with an introduction by Philip A. Ebert and Marcus Rossberg. Oxford: Oxford University Press, 2013. ISBN 978-0-19-928174-9.

### Philosophical studies

"Function and Concept" (1891)

* Original: "Funktion und Begriff", an address to the Jenaische Gesellschaft für Medizin und Naturwissenschaft, Jena, 9 January 1891.
* In English: "Function and Concept".

"On Sense and Reference" (1892)

* Original: "Über Sinn und Bedeutung", in Zeitschrift für Philosophie und philosophische Kritik C (1892): 25–50.
* In English: "On Sense and Reference", alternatively translated (in later edition) as "On Sense and Meaning".

"Concept and Object" (1892)

* Original: "Ueber Begriff und Gegenstand", in Vierteljahresschrift für wissenschaftliche Philosophie XVI (1892): 192–205.
* In English: "Concept and Object".

"What is a Function?" (1904)

* Original: "Was ist eine Funktion?", in Festschrift Ludwig Boltzmann gewidmet zum sechzigsten Geburtstage, 20 February 1904, S. Meyer (ed.), Leipzig, 1904, pp. 656–666.[13]
* In English: "What is a Function?".

Logical Investigations (1918–1923). Frege intended that the following three papers be published together in a book titled Logische Untersuchungen (Logical Investigations). Though the German book never appeared, the papers were published together in Logische Untersuchungen, ed. G. Patzig, Vandenhoeck & Ruprecht, 1966, and English translations appeared together in Logical Investigations, ed. Peter Geach, Blackwell, 1975.

* 1918–19. "Der Gedanke: Eine logische Untersuchung" ("The Thought: A Logical Inquiry"), in Beiträge zur Philosophie des Deutschen Idealismus I:[lower-alpha 4] 58–77.
* 1918–19. "Die Verneinung" ("Negation") in Beiträge zur Philosophie des Deutschen Idealismus I: 143–157.
* 1923\. "Gedankengefüge" ("Compound Thought"), in Beiträge zur Philosophie des Deutschen Idealismus III: 36–51.

### Articles on geometry

* 1903: "Über die Grundlagen der Geometrie". II. Jahresbericht der deutschen Mathematiker-Vereinigung XII (1903), 368–375.
* In English: "On the Foundations of Geometry".
* 1967: Kleine Schriften. (I. Angelelli, ed.). Darmstadt: Wissenschaftliche Buchgesellschaft, 1967 and Hildesheim, G. Olms, 1967. "Small Writings," a collection of most of his writings (e.g., the previous), posthumously published.

## See also

* Frege system
* List of pioneers in computer science
* Neo-Fregeanism
* Concept horse paradox

## Notes

1. ↑ Thesis title: Ueber eine geometrische Darstellung der imaginären Gebilde in der Ebene (On a Geometrical Representation of Imaginary Forms in a Plane).
2. ↑ Thesis title: Rechnungsmethoden, die sich auf eine Erweiterung des Größenbegriffes gründen (Methods of Calculation based on an Extension of the Concept of Magnitude).
3. ↑ Only the proofs of Part II of the Begriffsschrift are rewritten in modern notation in this work. Partial rewriting of the proofs of Part III is included in Boolos, George, "Reading the Begriffsschrift," Mind 94(375): 331–344 (1985).
4. ↑ The journal Beiträge zur Philosophie des Deutschen Idealismus was the organ of Deutsche Philosophische Gesellschaft [de; de].

## References

1. ↑ Monk, Ray (October 2017). "Gottlob Frege: The machine in the ghost" (in en). https://www.prospectmagazine.co.uk/ideas/philosophy/44997/gottlob-frege-the-machine-in-the-ghost.
2. ↑ Klement, Kevin C. (Fall 2014). "The Russell–Dummett Correspondence on Frege and his Nachlaß". The Bertrand Russell Society Bulletin (150): 25–29. https://people.umass.edu/~klement/brmd.pdf.
3. ↑ Dummett, Michael A. E. (1973). "Preface". Frege; philosophy of language. New York, Harper & Row. pp. xii. ISBN 978-0-06-011132-8. https://archive.org/details/fregephilosophyo0000dumm/mode/1up.
4. ↑ Hersh, Reuben, What Is Mathematics, Really? (Oxford University Press, 1997), p. 241.
5. ↑ Gottfried Gabriel, Wolfgang Kienzler (editors): "Gottlob Freges politisches Tagebuch". In: Deutsche Zeitschrift für Philosophie, vol. 42, 1994, pp. 1057–98. Introduction by the editors on pp. 1057–66.
6. ↑ Mendelsohn, Richard L. (December 1996). "Diary: Written by professor Dr Gottlob Frege in the time from 10 March to 9 April 1924: Edited and with commentary by Gottfried Gabriel and Wolfgang Kienzler" (in en). Inquiry 39 (3-4): 303–342. doi:10.1080/00201749608602425. ISSN 0020-174X. https://www.tandfonline.com/doi/abs/10.1080/00201749608602425.
7. ↑ Dummett, Michael A. E. (1973). Frege; philosophy of language. New York, Harper & Row. p. xii. ISBN 978-0-06-011132-8. https://archive.org/details/fregephilosophyo0000dumm/page/n15/mode/1up.
8. ↑ "Frege, Gottlob | Internet Encyclopedia of Philosophy" (in en-US). https://iep.utm.edu/frege/.
9. ↑ 9.0 9.1 Yvonne Sherratt (21 May 2013). Hitler's Philosophers. Yale University Press. pp. 60. ISBN 978-0-300-15193-0. OCLC 1017997313. https://books.google.com/books?id=zvsbrUEr1pwC&pg=PA60.
10. ↑ Hans Sluga: Heidegger's Crisis: Philosophy and Politics in Nazi Germany, pp. 99ff. Sluga's source was an article by Eckart Menzler-Trott: "Ich wünsch die Wahrheit und nichts als die Wahrheit: Das politische Testament des deutschen Mathematikers und Logikers Gottlob Frege". In: Forvm, vol. 36, no. 432, 20 December 1989, pp. 68–79. http://forvm.contextxxi.org/-no-432-.html
11. ↑ Frege's Lectures on Logic, ed. by Erich H. Reck and Steve Awodey, Open Court Publishing, 2004, pp. 18–26.
12. ↑ Jacquette, Dale, ed. (2019), "Chronology of Major Events in Frege's Life", Frege: A Philosophical Biography (Cambridge: Cambridge University Press): pp. xiii–xiv, doi:10.1017/9781139033725.001, ISBN 978-1-139-03372-5, https://www.cambridge.org/core/books/frege/chronology-of-major-events-in-freges-life/05A6B0C417981344CADAD7363F2B910F
13. ↑ Festschrift Ludwig Boltzmann gewidmet zum sechzigsten geburtstage 20. Februar 1904. Mit einem portrait, 101 abbildungen im text und 2 tafeln. Leipzig, J.A. Barth. 1904. https://archive.org/details/festschriftludw00meyegoog.

## Sources

### Primary

* Online bibliography of Frege's works and their English translations (compiled by Edward N. Zalta, Stanford Encyclopedia of Philosophy).
* 1879\. Begriffsschrift, eine der arithmetischen nachgebildete Formelsprache des reinen Denkens. Halle a. S.: Louis Nebert. Translation: Concept Script, a formal language of pure thought modelled upon that of arithmetic, by S. Bauer-Mengelberg in Jean Van Heijenoort, ed., 1967. From Frege to Gödel: A Source Book in Mathematical Logic, 1879–1931. Harvard University Press.
* 1884\. Die Grundlagen der Arithmetik: Eine logisch-mathematische Untersuchung über den Begriff der Zahl. Breslau: W. Koebner. Translation: J. L. Austin, 1974. The Foundations of Arithmetic: A Logico-Mathematical Enquiry into the Concept of Number, 2nd ed. Blackwell.
* 1891\. "Funktion und Begriff." Translation: "Function and Concept" in Geach and Black (1980).
* 1892a. "Über Sinn und Bedeutung" in Zeitschrift für Philosophie und philosophische Kritik 100:25–50. Translation: "On Sense and Reference" in Geach and Black (1980).
* 1892b. "Ueber Begriff und Gegenstand" in Vierteljahresschrift für wissenschaftliche Philosophie 16:192–205. Translation: "Concept and Object" in Geach and Black (1980).
* 1893\. Grundgesetze der Arithmetik, Band I. Jena: Verlag Hermann Pohle. Band II, 1903. Band I+II online . Partial translation of volume 1: Montgomery Furth, 1964. The Basic Laws of Arithmetic. Univ. of California Press. Translation of selected sections from volume 2 in Geach and Black (1980). Complete translation of both volumes: Philip A. Ebert and Marcus Rossberg, 2013, Basic Laws of Arithmetic. Oxford University Press.
* 1904\. "Was ist eine Funktion?" in Meyer, S., ed., 1904. Festschrift Ludwig Boltzmann gewidmet zum sechzigsten Geburtstage, 20. Februar 1904. Leipzig: Barth: 656–666. Translation: "What is a Function?" in Geach and Black (1980).
* 1918–1923. Peter Geach (editor): Logical Investigations, Blackwell, 1975.
* 1924\. Gottfried Gabriel, Wolfgang Kienzler (editors): Gottlob Freges politisches Tagebuch. In: Deutsche Zeitschrift für Philosophie, vol. 42, 1994, pp. 1057–98. Introduction by the editors on pp. 1057–66. This article has been translated into English, in: Inquiry, vol. 39, 1996, pp. 303–342.
* Peter Geach and Max Black, eds., and trans., 1980. Translations from the Philosophical Writings of Gottlob Frege, 3rd ed. Blackwell (1st ed. 1952).

### Secondary

Philosophy

* Badiou, Alain. "On a Contemporary Usage of Frege", trans. Justin Clemens and Sam Gillespie. UMBR(a), no. 1, 2000, pp. 99–115.
* Baker, Gordon, and P. M. S. Hacker, 1984. Frege: Logical Excavations. Oxford University Press. — Vigorous, if controversial, criticism of both Frege's philosophy and influential contemporary interpretations such as Dummett's.
* Currie, Gregory, 1982. Frege: An Introduction to His Philosophy. Harvester Press.
* Dummett, Michael, 1973. Frege: Philosophy of Language. Harvard University Press.
* \

, 1981. The Interpretation of Frege's Philosophy. Harvard University Press.
* Hill, Claire Ortiz, 1991. Word and Object in Husserl, Frege and Russell: The Roots of Twentieth-Century Philosophy. Athens OH: Ohio University Press.
* \

, and Rosado Haddock, G. E., 2000. Husserl or Frege: Meaning, Objectivity, and Mathematics. Open Court. — On the Frege-Husserl-Cantor triangle.
* Kenny, Anthony, 1995. Frege – An introduction to the founder of modern analytic philosophy. Penguin Books. — Excellent non-technical introduction and overview of Frege's philosophy.
* Klemke, E.D., ed., 1968. Essays on Frege. University of Illinois Press. — 31 essays by philosophers, grouped under three headings: 1. Ontology; 2. Semantics; and 3. Logic and Philosophy of Mathematics.
* Rosado Haddock, Guillermo E., 2006. A Critical Introduction to the Philosophy of Gottlob Frege. Ashgate Publishing.
* Sisti, Nicola, 2005. Il Programma Logicista di Frege e il Tema delle Definizioni. Franco Angeli. — On Frege's theory of definitions.
* Sluga, Hans, 1980. Gottlob Frege. Routledge.
* Nicla Vassallo, 2014, Frege on Thinking and Its Epistemic Significance with Pieranna Garavaso, Lexington Books–Rowman & Littlefield, Lanham, Maryland.
* Weiner, Joan, 1990. Frege in Perspective, Cornell University Press.

Logic and mathematics

* Anderson, D. J., and Edward Zalta, 2004, "Frege, Boolos, and Logical Objects," Journal of Philosophical Logic 33: 1–26.
* Blanchette, Patricia, 2012, Frege's Conception of Logic. Oxford: Oxford University Press, 2012
* Burgess, John, 2005. Fixing Frege. Princeton University Press. — A critical survey of the ongoing rehabilitation of Frege's logicism.
* Boolos, George, 1998. Logic, Logic, and Logic. MIT Press. — 12 papers on Frege's theorem and the logicist approach to the foundation of arithmetic.
* Dummett, Michael, 1991. Frege: Philosophy of Mathematics. Harvard University Press.
* Demopoulos, William, ed., 1995. Frege's Philosophy of Mathematics. Harvard University Press. — Papers exploring Frege's theorem and Frege's mathematical and intellectual background.
* Ferreira, F. and Wehmeier, K., 2002, "On the consistency of the Delta-1-1-CA fragment of Frege's Grundgesetze," Journal of Philosophic Logic 31: 301–11.
* Grattan-Guinness, Ivor, 2000. The Search for Mathematical Roots 1870–1940. Princeton University Press. — Fair to the mathematician, less so to the philosopher.
* Gillies, Donald A., 1982. Frege, Dedekind, and Peano on the foundations of arithmetic. Methodology and Science Foundation, 2. Van Gorcum & Co., Assen, 1982.
* Gillies, Donald. "The Fregean revolution in logic". Revolutions in Mathematics, 265–305, Oxford Sci. Publ., Oxford University Press, New York, 1992.
* Irvine, Andrew David, 2010, "Frege on Number Properties," Studia Logica, 96(2): 239–60.
* Charles Parsons, 1965, "Frege's Theory of Number". Reprinted with Postscript in Demopoulos (1965): 182–210. The starting point of the ongoing sympathetic reexamination of Frege's logicism.
* Heck, Richard Kimberly. Frege's Theorem. Oxford: Oxford University Press, 2011
* Heck, Richard Kimberly. Reading Frege's Grundgesetze. Oxford: Oxford University Press, 2013
* Wright, Crispin, 1983. Frege's Conception of Numbers as Objects. Aberdeen University Press. — A systematic exposition and a scope-restricted defense of Frege's Grundlagen conception of numbers.

Historical context

* Everdell, William R. (1997), The First Moderns: Profiles in the Origins of Twentieth Century Thought, Chicago: University of Chicago Press, ISBN 9780226224848, https://books.google.com/books?id=kNMlDAAAQBAJ

## External links

* Error in Template:Internet Archive author: Gottlob Frege doesn't exist.
* Frege at Genealogy Project
* A comprehensive guide to Fregean material available on the web by Brian Carver.
* Stanford Encyclopedia of Philosophy:
* "Gottlob Frege" — by Edward Zalta.
* "Frege's Logic, Theorem, and Foundations for Arithmetic" — by Edward Zalta.
* Internet Encyclopedia of Philosophy:
* Gottlob Frege — by Kevin C. Klement.
* Frege and Language — by Dorothea Lotter.
* Metaphysics Research Lab: Gottlob Frege.
* Frege on Being, Existence and Truth.
* O'Connor, John J.; Robertson, Edmund F., "Gottlob Frege", MacTutor History of Mathematics archive, University of St Andrews, http://www-history.mcs.st-andrews.ac.uk/Biographies/Frege.html .
* Begriff, a LaTeX package for typesetting Frege's logic notation, earlier version.
* grundgesetze, a LaTeX package for typesetting Frege's logic notation, mature version
* Frege's Basic Laws of Arithmetic, website, incl. corrigenda and LaTeX typesetting tool — by P. A. Ebert and M. Rossberg.

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