Exercise:

FORALL x(I) [EXISTS y(I) P(OII) x y IMPLIES FORALL y Q(OII) x y] AND FORALL z(I) EXISTS y P z y IMPLIES FORALL y FORALL x Q x y

You may not use ADVICE, but all other rules and commands 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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