Jacob ben Nissim

Jacob ben Nissim ibn Shahin

Born| 10th century

Kairouan, Tunisia

Died| 10th century

Notable work

| Commentary on Sefer Yeẓirah, Ḥisab al-Ghubar
Region| Jewish philosophy

Main interests

| Sefer Yeẓirah, Indian mathematics

Notable ideas

| Commentary on Sefer Yeẓirah, Ḥisab al-Ghubar

Jacob ben Nissim ibn Shahin was a Jewish philosopher and mathematician who lived in Kairouan, Tunisia, in the 10th century; he was a younger contemporary of Saadia. At Jacob's request, Sherira Gaon wrote a treatise entitled Iggeret, on the redaction of the Mishnah. Jacob is credited with the authorship of an Arabic commentary on the Sefer Yeẓirah (translated into Hebrew by Moses ben Joseph).

He asserts in the introduction that Saadia, while living in Egypt, used to address very insignificant questions to Isaac ben Solomon of Kairouan, and that, on receiving Saadia's commentary, he found that the text had not been understood by the commentator. Jacob therefore decided to write another commentary. In the same introduction Jacob speaks of Galen, repeating the story that that celebrated physician was a Jew named "Gamaliel." The Hebrew translation of Jacob's commentary is still extant in manuscript;[1] excerpts from it have been given by M. H. Landauer and Dukes.

Jacob ben Nissim wrote a work on Indian mathematics under the title Ḥisab al-Ghubar (Hebrew: האבק חשבון).

His son and student, Nissim (referred to in later Rabbinic literature as Rabbeinu Nissim, or in Hebrew רבנו ניסים), later became the head of Yeshiva at Kairouan.

## References

1. ↑ Munich MSS., No. 92, 20; De Rossi MSS., No. 769

This article incorporates text from a publication now in the public domain: Kaufmann Kohler and Isaac Broydé (1901–1906). "Jacob ben Nissim ibn Shahin". in Singer, Isidore. The Jewish Encyclopedia. New York: Funk & Wagnalls. http://www.jewishencyclopedia.com/view.jsp?letter=J&artid=86. It has the following bibliography:

* M. H. Landauer, in Orient, vii. 121;
* Julius Fürst, ib. vi. 562;
* Dukes, Ḳonṭres ha-Masoret;
* Salomon Munk, Notice sur Aboulwalid, p. 47;
* Moritz Steinschneider, Cat. Bodl. col. 1243;
* idem, Hebr. Uebers. p. 396;
* idem, Die Arabische Literatur der Juden, § 58.K

Rosh Yeshiva

New title |  Rosh Yeshiva of Kairouan
?-1006  | Succeeded by
Chushiel ben Elchanan

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