think in sets

Hi



Maybe someone can give me a hand with this,



Let E be a set, with subsets A in E and B in E, and * be the operation A * B
= (E - A) intersect with

(E - B), now using A, B and *, how can I express A U B



the best I thought of is this;

A * B = (Not A) intersect with (Not B) = not ( A U B), any more than that
will need some explanations.



thanks


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