Withers, John William, 1868- Euclid's parallel postulate : its nature, validity, and place in geometrical systems ... / by John William Withers ...

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Withers, John William, 1868-

Euclid's parallel postulate : its nature, validity, and place in geometrical systems ... / by John William Withers ...

Geometry, Non-Euclidean.

Parallels (Geometry)