Exercise:

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.

No more help available. Sorry.

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