Title: The Book of the Explanation of the Excursion in the Science of Calculus
Description
 The present manuscript preserves a copy of Aḥmad ibn Qāsim alShāfi‘ī alĠhazzī's Kitāb sharḥ alnuzha fī ‘ilm alḥisāb (The book of the explanation of the excursion in the science of calculus), a work that exemplifies the lively interest in the mathematical sciences that persisted in the Islamic world well after the end of the "classical" period that saw the flowering of Arabic sciences. Kitāb sharḥ alnuzha fī ‘ilm alḥisāb is technically a supercommentary. AlĠhazzī ’s work is an explanation of Nuzhat alnuẓẓār fī ‘ilm alghubār (The excursion of the observer in the science of numerals), which in turn was an abridgment by Aḥmad ibn Muḥammad alFarāḍī ibn alHā'im (around 13561412) of his own mathematical treatise entitled Murshid alṭālib ilā asnā' almaṭālib (A student guide to the summit of learning). The original work, the abridgement, and the commentary all have an explicit didactic aim. The discussion of numerals and the treatment of the four arithmetical operations are presented in an incremental and extremely clear way. In the present manuscript, rubricated headings and passages underlined in red ink help the reader to identify the sections of the treatise and to distinguish between the original treatise by Ibn alHā'im and alĠhazzī's work. The latter is characterized by a large number of practical examples, with mathematical operations explained both in the text and displayed in tables.
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Title in Original Language

شرح العلامة احمد ابن قاسم الغزي الشافعي على النزهة في الحساب لإبن الهائم
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Physical Description
 64 leaves (23 lines), bound : paper ; 24 x 16 centimeters
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