X5209 : %THEOREM%X5209 is a theorem.
POWERSET(O(OA)(OA)) [D(OA) INTERSECT E(OA)] = POWERSET D INTERSECT POWERSET E
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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