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Proof without Words: A Triangular Identity

by Roger B. Nelsen (Lewis and Clark College)

This article originally appeared in:
Mathematics Magazine
October, 1994

Subject classification(s): Recursion
Applicable Course(s): 4.3 Number Theory | 3.7 Discrete Math

A geometric demonstration of a recursive identity for triangular numbers

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Capsule Course Topic(s):
Number Theory | Numbers With Special Forms or Properties
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