Exercise:

FORALL x(I) P(OI) x IMPLIES EXISTS y(I) .FORALL x FORALL z(I) Q(OIII) x y z IMPLIES ~FORALL z .P z AND ~Q y y z

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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