X5203 : %THEOREM%

X5203 is a theorem.
Exercise:
% f(AB) [x(OB) INTERSECT y(OB)] SUBSET % f x INTERSECT % f 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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