al-Kashi J

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.

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Date Modified: 2022.0224