X5204 : %THEOREM%

X5204 is a theorem.
% f(AB) [SETUNION w(O(OB))] = SETUNION .% [% f] w
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.
No more help available. Sorry.

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