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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