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4th Edition

Richard N. Aufmann + 3 others

Publisher: Cengage Learning

ISBN: 9781305965584

Chapter 5.3, Problem 15ES

Textbook Problem

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Show that the graph is not planar by finding a subgraph whose contraction is the Utilities Graph or

To determine

**To Prove:**

The given graph is not a planar by finding a subgraph whose contractions is a Utility Graph or

**Given information:**

The graph is

**Proof:**

Let's prove the given graph contracts to Utility Graph or

Choose some pairs of adjacent outside edges and contract them.

Consider the graph

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