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On Examples, Counterexamples, and Proof by Example


  • Thomas Mitchell

    (Southern Illinois University at Carbondale)


This note is motivated by two seemingly unrelated items that have recently appeared in the Pi Mu Epsilon Journal ( In one, the editor of the Journal wrote of "mathematical cranks" and how frustratingly difficult it can be sometimes to get would-be "circle-squarers" and "angle- trisectors" to see the errors in their "proofs." The first part of this paper illustrates--by way of example!--how futile is a "proof" that is attempted with one or more examples. The second part of the paper follows up on a recent article in the PME Journal, "How Economists Use Mathematics to Show Why Some People Work So Much For So Little," and shows that the author's result is a consequence of the special characteristics of the Cobb-Douglas utility function.

Suggested Citation

  • Thomas Mitchell, 1996. "On Examples, Counterexamples, and Proof by Example," General Economics and Teaching 9607001, EconWPA.
  • Handle: RePEc:wpa:wuwpgt:9607001
    Note: Type of Document - Tex; prepared on IBM PC; to print on HP;

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    Proving theorems; special cases; Pi Mu Epsilon Journal;

    JEL classification:

    • A - General Economics and Teaching

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