X5207 : %THEOREM%

X5207 is a theorem.
% f(AB) [x(OB) INTERSECT y(OB)] SUBSET % f x INTERSECT % f y
You may ASSERT the following theorems, without proof, as lemmas : (X5201
You may also ASSERT any book theorem (type PROBLEMS for a list of them).
No more help available. Sorry.

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