Mystery Theme #3 by PolinskyL

Question 2

There are a plethora of examples of WHAT TOPOGRAPHICAL CONCEPT, for a space that resembles Euclidean space near each point, but not globally? It was part of the topic of the first original paper written by a mathematician who learned, in one word, the secret of success in mathematics from the great Nikolai Ivanovich Lobachevsky.

Manifold

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