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Shows how to use Excel to represent the pool table problem and variations. Uses sliders to gather much data quickly. Excel level: Intermediate. ...

Part 4 of Lecture 17.

Proof by induction that if alpha + 1/alpha is an integer, then alpha^n + 1/alpha^n is an integer, for all natural numbers n.

A first look at generalizing the notion of natural transformation to the enriched setting.