Modelle des Kosmos: Der gekruemmte Raum

Modelle des Kosmos: Der gekruemmte Raum

Geometry and Experience
Extended version of a lecture held by Einstein, Berlin 1921

Einstein rejects the global validity of Euclidean geometry in reality:

As far as the theorems of mathematics refer to reality, they are not certain; and as far as they are certain, they do not refer to reality.


A. Einstein, Geometrie und Erfahrung

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