X2119 : %THEOREM%X2119 is a theorem.
EXISTS y(I) FORALL x(I) .P(OI) y IMPLIES P 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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