Exercise:

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