X5200 : %THEOREM%X5200 is a theorem.
x(OA) UNION y(OA) = SETUNION .LAMBDA v(OA) .v = x OR v = y
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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