3. Let G be a plane graph. (3) Show that the plane dual G* has no odd cycles. (4) Show that degg(u) is even for all u e V(G) if and only if we have x(G*) = 2.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter11: Topics From Analytic Geometry
Section: Chapter Questions
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3. Let G be a plane graph.
(3) Show that the plane dual G* has no odd cycles.
(4) Show that degc(u) is even for all u e V(G) if and only if we have
x(G*) = 2.
Transcribed Image Text:3. Let G be a plane graph. (3) Show that the plane dual G* has no odd cycles. (4) Show that degc(u) is even for all u e V(G) if and only if we have x(G*) = 2.
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