Concept explainers
Limit of 5. Start drawing a planar graph. Keep adding vertices, and as many edges as you can but avoiding edge crossings. When you get up to about ten vertices, stop and see if your graph has a vertex of degree five or less (a vertex with at most five edges joined to it).
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The Heart of Mathematics: An Invitation to Effective Thinking, WileyPLUS NextGen Card with Loose-leaf Set Single Semester: An Invitation to Effective Thinking (Key Curriculum Press)
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