X2130 : %THEOREM%X2130 is a theorem.
FORALL x(I) P(OI) x IMPLIES ~EXISTS y(I) Q(OI) y OR EXISTS z(I) .P z IMPLIES Q z
All 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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