Penn Library's LJS 481 - [Ḥaṭṭ al-niqāb ʻan wujūh aʻmāl al-ḥisāb]. (Video Orientation)

https://repository.upenn.edu/sims_ebooks/33/

https://openn.library.upenn.edu/Data/0001/html/ljs481.html

Video Orientation to the University of Pennsylvania Library's LJS 481, a commentary on the summary of arithmetical operations by the late 13th- and early 14th-century scholar Ibn al-Bannāʼ. Demonstrates with examples the calculation of sums involving fractional numbers and square roots. Extensive marginal notes on a few leaves (p. 20-35). The first leaf is missing and the text ends abruptly. Several leaves have restored outer margins. Pages 189-194 missing text because of conservation after water damage. Written in northern Africa, probably Morocco, in the 15th or 16th century. Record on Franklin, with link to a digital copy: https://franklin.library.upenn.edu/catalog/FRANKLIN_9959542723503681 Record on Internet Archive, with a link to PDF: https://archive.org/details/ljs481