Exercise:

EXISTS v(I) FORALL y(I) EXISTS z(I) .P(OIII) a(I) y [h(II) y] OR P v y [f(II) y] IMPLIES P v y 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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