X2124 : %THEOREM%

X2124 is a theorem.
Exercise:
EXISTS x(I) [P(OI) x IMPLIES Q(OI) x] EQUIV FORALL x P x IMPLIES EXISTS x Q 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.

TPS documentation homepage


© 1988-99, Carnegie Mellon University.

TPS homepage