A Criticism on Rosenfeld's Argumentation on the Attribution of a Mathematical Treatise to Ulugh Beg

Al-Kāshī’s novel method for the determination of the sine of one degree is one of the most significant contributions to the Islamic mathematics. He explained this method in Risāla al-Watarwa al-Djayb (treatise on the chord and the sine) which no manuscript of it have yet been found; and therefore the attention of the history of sciences researchers has been attracted to Risāla fi IstikhrādjDjaybDaradjaWāḥida (treatise on the determination of the sine of one degree). This treatise is written by Ḳāḍizāda al-Rūmī, al-Kāshī’s friend and colleague, and provides a detailed commentary on al-Kāshī’s method.Presenting valid documents and evidences, this article aims to prove Ḳāḍizāda’s authorship of the aforementioned treatise.