13

This number is a prime.

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Girolamo Cardano (1501-1576) divided cubic equations into 13 types (excluding x^3 = c and equations reducible to quadratics) in his work Ars Magna, which was the first Latin treatise devoted solely to algebra. [Poo Sung]

Submitted: 2005-05-16 12:58:57; Last Modified: 2009-05-04 18:44:29.