X2136 : %THEOREM%X2136 is a theorem.
EXISTS x(I) EXISTS y(I) FORALL u(I) .P(OIII) x y z(I) IMPLIES P u x 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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