X6104 : %THEOREM%X6104 is a theorem.
EXISTS i(O(AA)(AA)) .FORALL g(AA) [i g [LAMBDA x(A) x] AND i g .LAMBDA x g .g x] AND FORALL f(AA) FORALL y(A) .i [LAMBDA x y] f IMPLIES f y = y
All rules and commands, including ADVICE, are allowed.
Only book theorems may be ASSERTed as lemmas without proof.
For a complete list of book theorems, type PROBLEMS.
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