proof Lemma contrap : forall P Q : Prop, (P -> Q) -> (~Q -> ~P). use coq
Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
Chapter2: Parallel Lines
Section2.CT: Test
Problem 3CT: To prove a theorem of the form "If P, then Q" by the indirect method, the first line of the proof...
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proof
Lemma contrap : forall P Q : Prop, (P -> Q) -> (~Q -> ~P). use coq
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