Edge count. Look at all the trees you drew in the previous Mindscape. Count the edges in each tree. How does the number of edges relate to the number of vertices in the tree? Draw some more trees and see if your relation holds. Make a conjecture.
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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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