X2106 : %THEOREM%X2106 is a theorem.
FORALL x(I) [R(OI) x IMPLIES P(OI) x] AND FORALL x [~Q(OI) x IMPLIES R x] IMPLIES FORALL x .P x OR 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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