From test cases to special cases: Four undergraduates unpack a formula for combinations

Basic Algebra I.

Andy R. Magid, Nathan Jacobson · American Mathematical Monthly · 1986 · 842 citations

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Life Sciences, Neuroscience, Philosophy +8

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James J. Kaput, Robert B. Davis · College Mathematics Journal · 1985 · 366 citations

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Andrea A. diSessa, Bruce Sherin · The Journal of Mathematical Behavior · 2000 · 237 citations