X2123 : %THEOREM%

X2123 is a theorem.
Exercise:
EXISTS y(I) [P(OI) y IMPLIES Q(OI) x(I)] IMPLIES EXISTS y .P y IMPLIES Q y
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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