"He appears to be the first who could perform such operations as (x - 1) \times (x - 2) without reference to geometry. Such identities as (a + b)^2 = a^2 + 2ab + b^2, which with Euclid appear in the elevated rank of geometric theorems, are with Diophantus the simplest consequences of the algebraic laws of operation."
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Florian Cajori, A History of Mathematics (1893).
https://en.wikiquote.org/wiki/Diophantus
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Diophantus
Diophantus of Alexandria (c. 201 - 285 AD) sometimes called "the father of algebra", was an Alexandrian Greek mathematician and the author of a series of books called Arithmetica (c. 250 AD), many of which are now lost. Diophantus was the first Greek mathematician who recognized fractions as numbers, thus allowed positive rational numbers for the coefficients and solutions.
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