gorgeous
发表于 2025-3-30 10:29:01
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VOK
发表于 2025-3-30 16:14:56
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Gorilla
发表于 2025-3-30 16:34:30
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Free-Radical
发表于 2025-3-31 00:02:17
The Pigeonhole Principle,ous (since on supposing the contrary, one obtains a contradiction immediately by counting the pigeons). It might seem unlikely that such a simple idea could be used to obtain nontrivial results, yet.… We begin, as usual, with some standard elementary problems .