X2133 : %THEOREM%

X2133 is a theorem.
Practice Exercise:
FORALL x(I) [EXISTS y(I) Q(OII) x y IMPLIES P(OI) x] AND FORALL v(I) EXISTS u(I) Q u v AND FORALL w(I) FORALL z(I) [Q w z IMPLIES Q z w OR Q z z] IMPLIES FORALL z P 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.
No more help available. Sorry.

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