| Mark Smith has accounted for 18 full or near-complete manuscripts, and five fragments, which are preserved in 14 locations, including one in the at , and one in the library of | Risner is also the author of the name variant "Alhazen"; before Risner he was known in the west as Alhacen |
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| 1039 , known in the West as Alhazan, was a leading Arab mathematician, astronomer, and physicist | ", , 18 10 , retrieved 2008-10-14• 2nd century gave this account in addition to refraction , and he credited it to c |
In Thomas Hockey; et al.
7| Alhazen continued to live in Cairo, in the neighborhood of the famous , and lived from the proceeds of his literary production until his death in c | 2000 , Global History of Philosophy: The Period of Scholasticism, ,• He used his result on sums of integral powers to perform what would now be called an , where the formulas for the sums of integral squares and fourth powers allowed him to calculate the volume of a |
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| His later argument that refracted rays would be perceived as if perpendicular does not seem persuasive | 139 harvnb error: no target: CITEREFSambursky1974 |
He was also the first to demonstrate that vision occurs in the brain, rather than in the eyes.
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