Multilinear algebra

Branch of mathematics

Multilinear algebra is the study of functions with multiple vector-valued arguments, with the functions being linear maps with respect to each argument. It involves concepts such as matrices, tensors, multivectors, systems of linear equations, higher-dimensional spaces, determinants, inner and outer products, and dual spaces. It is a mathematical tool used in engineering, machine learning, physics, and mathematics.[1]

## Origin

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While many theoretical concepts and applications involve single vectors, mathematicians such as Hermann Grassmann considered structures involving pairs, triplets, and multivectors that generalize vectors. With multiple combinational possibilities, the space of multivectors expands to 2n dimensions, where n is the dimension of the relevant vector space.[2] The determinant can be formulated abstractly using the structures of multilinear algebra.

Multilinear algebra appears in the study of the mechanical response of materials to stress and strain, involving various moduli of elasticity. The term "tensor" describes elements within the multilinear space due to its added structure. Despite Grassmann's early work in 1844 with his Ausdehnungslehre, which was also republished in 1862, the subject was initially not widely understood, as even ordinary linear algebra posed many challenges at the time.

The concepts of multilinear algebra find applications in certain studies of multivariate calculus and manifolds, particularly concerning the Jacobian matrix. Infinitesimal differentials encountered in single-variable calculus are transformed into differential forms in multivariate calculus, and their manipulation is carried out using exterior algebra.[3]

Following Grassmann, developments in multilinear algebra were made by Victor Schlegel in 1872 with the publication of the first part of his System der Raumlehre[4] and by Elwin Bruno Christoffel. Notably, significant advancements came through the work of Gregorio Ricci-Curbastro and Tullio Levi-Civita,[5] particularly in the form of absolute differential calculus within multilinear algebra. Marcel Grossmann and Michele Besso introduced this form to Albert Einstein, and in 1915, Einstein's publication on general relativity, explaining the precession of Mercury's perihelion, established multilinear algebra and tensors as important mathematical tools in physics.

In 1958, Nicolas Bourbaki included a chapter on multilinear algebra titled "Algèbre Multilinéaire" in his series Éléments de mathématique, specifically within the algebra book. The chapter covers topics such as bilinear functions, the tensor product of two modules, and the properties of tensor products.[6]

## Applications

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Multilinear algebra concepts find applications in various areas, including:

* Classical treatment of tensors
* Dyadic tensor
* Glossary of tensor theory
* Metric tensor
* Bra–ket notation
* Multilinear subspace learning

## See also

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* Multivector
* Geometric algebra
* Clifford algebra
* Closed and exact differential forms
* Component-free treatment of tensors
* Cramer's rule
* Dual space
* Einstein notation
* Exterior algebra
* Inner product
* Outer product
* Kronecker delta
* Levi-Civita symbol
* Multilinear form
* Pseudoscalar
* Pseudovector
* Spinor
* Tensor
* Tensor algebra, Free algebra
* Tensor contraction
* Symmetric algebra, Symmetric power
* Symmetric tensor
* Mixed tensor

## References

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1. ^ Pandey, Divyanshu; Venugopal, Adithya; Leib, Harry (2024). "Linear to multi-linear algebra and systems using tensors". Frontiers in Applied Mathematics and Statistics. 9. arXiv:2304.10658. doi:10.3389/fams.2023.1259836. ISSN 2297-4687.
2. ^ Grassmann, Hermann (2000) [1862]. Extension Theory [Die Ausdehnungslehre]. Translated by Kannenberg, Lloyd. American Mathematical Society. ISBN 978-0-8218-9049-3.
3. ^ Fleming, Wendell H. (1977). "Exterior algebra and differential calculus". Functions of Several Variables. Undergraduate Texts in Mathematics (2nd ed.). Springer. pp. 275–320. doi:10.1007/978-1-4684-9461-7_7. ISBN 978-1-4684-9461-7. OCLC 2401829.
4. ^ Schlegel, Victor (2018). System der Raumlehre: Nach den Prinzipien der Grassmann'schen Ausdehnungslehre und als Einleitung in Dieselbe; Geometrie; Die Gebiete des Punktes, der Geraden, der Ebene. Forgotten Books. ISBN 978-0-364-22177-8.
5. ^ Ricci-Curbastro, Gregorio; Levi-Civita, Tullio (1900). "Méthodes de calcul différentiel absolu et leurs applications". Mathematische Annalen. 54 (1): 125–201. doi:10.1007/BF01454201. ISSN 1432-1807. S2CID 120009332.
6. ^ Nicolas Bourbaki (1958) Algèbra Multilinéair, chapter 3 of book 2 Algebra, in Éléments de mathématique, Paris: Hermann

* Greub, W. H. (1967) Multilinear Algebra, Springer
* Douglas Northcott (1984) Multilinear Algebra, Cambridge University Press ISBN 0-521-26269-0
* Shaw, Ronald (1983). Multilinear algebra and group representations. Vol. 2\. Academic Press. ISBN 978-0-12-639202-9. OCLC 59106339.

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* Kronecker delta
* Levi-Civita symbol
* Metric tensor
* Nonmetricity tensor
* Ricci curvature
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* Moment of inertia
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* Élie Cartan
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