Exercise:

FORALL x(I) [R(OI) x IMPLIES P(OI) x] AND FORALL x [~Q(OI) x IMPLIES R x] IMPLIES FORALL x .P x OR Q x

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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