the logical treatise al-muhja has been attributed to avicenna in some bibliographies of logical treatises. since a proper understanding of the development of avicennian logic rests on the identification and consideration of the entire corpus of his logical works, the task of the present study is to investigate the validity of ascription of this treatise to avicenna. in carrying out an analysis ...

In this paper, we study Ghiyath al-Din Jamshid al-Kashi's (1380-1429 A.D.) main mathematical achievements. We discuss his al-Risala al-muhitiyya ("The Treatise on the Circumference"), Risala al-watar wa'l-jaib ("The Treatise on the Chord and Sine"), and Miftah al-hisab ("The Key of Arithmetic"). In particular, we look at al-Kashi's fundamental theorem, his calcula...

manuscript no. 3447 in national library of tabriz is a persian treatise which covers arithmetic, geometry, algebra, hayʾa and the topic of “masses and distances. the redaction of the text has been finished in 670ah/1271ad but we don’t know anything about the author of the treatise. in the two first chapters of his treatise (on arithmetic) the unknown author draws upon ʿabd al-qāhir al-baghdādī’...

athir al-din al-abhari has a treatise bibliographies have called “thamani ‘ashra mas’ala fi al-kalam” (i.e., 18 problems in theology) or “al-mas’il” (i.e. the problems), but our findings show that its real name is “tahrir al-dalail fi taqrir al-masa’il” (i.e. the introduction of arguments for the establishment of the problems). the treatise, which is presumably his only writing in kalam, contai...

this article is devoted to kamāl al-dīn al-fārsī’s (d. 1319) additions to some remarks contained in book xiii of al-ṭūsī’s taḥrīr uṣūl al-handasa, concerning the construction of a semi-regular polyhedron inscribed into a sphere using the movement as a way for the construction. this treatise is one treatise among ten found in a codex preserved at the bibliothèque nationale de tunis.

the treatise entitled “arithmetic in astronomy”, which is edited and commented upon in this paper, is part of an old manuscript collection preserved in the national library of bosnia and herzegovina. at the end of this treatise there are some phrases in arabic which show that the treatise was originally part of a persian book written by ʿalī al-qūshchī. this manuscript is, in fact, an abridged ...

for the first time in the history of logic, abd al razzaq al-jili (d. 570/1174), in the treatise al-lame fi al-shakl al-rabe, dealt with the modal syllogisms of the fourth figure. previous to him, dinha, the priest, and ibn salah al-hamadani had discussed the non-modal moods of the fourth figure. jili’s treatise deals only with simple modalities and ignores the complex ones. his pupil, fakhr al...

the mathematical treatises known as ta?r?r al-mutawassi??t, “revision of the middle books”, are a collection of greek and arabic treatises which were re-edited by na??r al-d?n al-??s?. this paper explores the nature of the editorial work ??s? did, showing that it is not a simple rendering of the original text but that it involves major revisions and in fact original additions. for the first tim...