Other commentaries which Pappus wrote include one on Euclid's Elements. Proclus, in his own commentary on the Elements refers three times to Pappus's commentary and Eutocius also refers to Pappus's commentary. Part of Pappus's commentary may exist in an Arabic translation, namely that on Book X of the Elements. However, the commentary is very different in style to that of the Mathematical Collection and if indeed Pappus is the author it is a commentary which fails to show the depth of understanding that he shows in other parts of his work.