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: Without the departure from Euclid’s "feature," Einstein wouldn't have had the math to describe General Relativity—the idea that space itself is curved.

: In the 19th century, mathematicians realized that if you change this one rule, you get "Non-Euclidean" geometries. evklid nachala skachat fb2

: Euclid tried to prove this postulate from simpler ones but couldn't. This struggle birthed the rigour of modern mathematics. : Without the departure from Euclid’s "feature," Einstein