Class 19

Monday, February 23

Today’s Discussion Topics

Go over discussion topic from last time

Today’s New Topics

Statements equivalent to the Euclidean Parallel Postulate
Theorem 4.7.1 presented by Lucas
Theorem 4.7.2

Tonight’s Homework

Read Section 4.7
Do exercises section 4.7 # 2, 3
Discussion topic for next time: What is “defect” and what does Theorem 4.8.4 mean?