EUCLID
or
EINSTEIN
by
J. J. CALLAHAN
Chapter I
Chapter II
Chapter III
Chapter IV
Chapter V
Chapter VI
Chapter VII
Chapter VIII
Chapter IX
Front Matter
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Introduction
Euclidean Geometry
History of the Parallel Theory
History of Non-Euclidean Geometry
Proof of Euclid’s Postulate
The Parallel Theory
Definition of Parallel Lines
The Verdict on Metageometry
The Geometry of Four Dimensions
Einstein and Euclidean Geometry
