X2111 : %THEOREM%X2111 is a theorem.
FORALL x(I) [EXISTS y(I) P(OII) x y IMPLIES FORALL y Q(OII) x y] AND FORALL z(I) EXISTS y P z y IMPLIES FORALL y FORALL x Q x y
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.
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