X2124 : %THEOREM%X2124 is a theorem.
EXISTS x(I) [P(OI) x IMPLIES Q(OI) x] EQUIV FORALL x P x IMPLIES EXISTS x 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.
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