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At: phole lemma


n:{1...}, m:{n+1...}, f:(mn). i,j:m. i < j & f(i) = f(j)

By: GenUnivCD

Generated subgoal:

11. n: {1...}
2. m: {n+1...}
3. f: mn
i,j:m. i < j & f(i) = f(j)


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allnatural_numberaddfunctionexists
andless_thanequalapply