X2117 : %THEOREM%

X2117 is a theorem.
Practice Exercise:
FORALL u(I) FORALL v(I) [R(OII) u u EQUIV R u v] AND FORALL w(I) FORALL z(I) [R w w EQUIV R z w] IMPLIES .EXISTS x(I) R x x IMPLIES FORALL y(I) R y y
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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