MATH 7200 Discussion Points, Section 1.1
Euclidean Parallel Postulate.
Through a given point not on a line l there is exactly one line parallel to l.
Hyperbolic Parallel Postulate
Given a line l and a point P not on l, there exist at least two lines through P that are parallel to l.
George David Birkoff
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1.1 Angles and their Measurement
Pairs of Angles
EXAMPLE 1 --- This is the proof presented in the text. Are there any questions?
Problem Set 1.1