X5309 : %THEOREM%X5309 is a theorem.
~EXISTS h(I(OI)) FORALL p(OI) FORALL q(OI) .h p = h q IMPLIES p = q
All rules and commands, including ADVICE, are allowed.
Only book theorems may be ASSERTed as lemmas without proof.
For a complete list of book theorems, type PROBLEMS.
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