Sofya Kovalevskaya, Mathematician (Russia 2025)

Stamp Sofya Kovalevskaya, Mathematician it reflects the thematic directions:

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One of the earliest known mathematicians was Thales of Miletus (c. 624 – c. 546 BC); he has been hailed as the first true mathematician and the first known individual to whom a mathematical discovery has been attributed.He is credited with the first use of deductive reasoning applied to geometry, by deriving four corollaries to Thales's theorem.

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