Practice Exercise:

FORALL x(I) [EXISTS y(I) Q(OII) x y IMPLIES P(OI) x] AND FORALL v(I) EXISTS u(I) Q u v AND FORALL w(I) FORALL z(I) [Q w z IMPLIES Q z w OR Q z z] IMPLIES FORALL z P z

All 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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