Exercise:

FORALL w(I) [~R(OII) w w] IMPLIES EXISTS x(I) EXISTS y(I) .~R x y AND .Q(OII) y x IMPLIES FORALL z(I) Q z 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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