X2127 : %THEOREM%

X2127 is a theorem.
Exercise:
EXISTS x(I) FORALL y(I) [P(OI) y EQUIV P x] IMPLIES FORALL x P x OR FORALL 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.
No more help available. Sorry.

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