Exercise:

FORALL x(I) R(OII) x b(I) AND FORALL y(I) [EXISTS z(I) R y z IMPLIES R a(I) y] IMPLIES EXISTS u(I) FORALL v(I) R u v

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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