X2113 : %THEOREM%X2113 is a theorem.
FORALL y(I) EXISTS w(I) R(OII) y w AND EXISTS z(I) FORALL x(I) [P(OI) x IMPLIES ~R z x] IMPLIES EXISTS x .~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.
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