#proof help

6 messages · Page 1 of 1 (latest)

dire oakBOT
radiant grove
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Do you understand the question? What have you tried?

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There's a simple typo in the first line, right? I think it should say: Let A be a finite set.

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Anyway, my instinct says induction.

mystic anvil
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This is IMO 1992/P5