When1: 1407
When2: 1427
Who: Jamshid al-Kashi [al-Kashi, Jamshid]
What: mathematician
Where: Samarkand, Kazakhstan
works\ Stairway of Heaven [1407]; Compendium of the Science of Astronomy [1411]; Key to Arithmetic [1427]
Detail: He lived 1390 to 1450 and used base-ten number system, decimals, and negative powers.
Mathematical Sciences>Mathematics>History>Ancient Mathematics
3-Mathematics-History-Ancient Mathematics
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Date Modified: 2022.0224