1. History of the Quadratic Equation
... Egypt. Proclus, the last major Greek philosopher, who lived around 450 AD wrote: Not much younger than these [pupils of Plato] is Euclid, who put together the "Elements", arranging in order many of Eudoxus' theorems, perfecting many of Theaetetus's, and also bringing to irrefutable demonstration the things which had been only loosely proved by his predecessors. This man ... first to determine a result undefined. Unlike most European algebraists of the Middle Ages, he recognized negative and irrational numbers as possible roots of an equation. Brahmagupta distinguished twenty arithmetica...
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