Non-Euclidean Geometry - JSTOR

1 950 ) NON-EUCLIDEAN GEOMETRY 21 can be deternmined by geometry alone. We must use physical aids like the standard meter at Paris. The existence of absolute lengths is one of the main differences between the euclidean and the two non-euclidean geometries. The relation sin x/x 1 for x 0 O, which is familiar from calculus, and (1) show that ................
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