# Problem Solving

## CONTENTS OF CURRICULUM UNIT 80.07.04

## Logic and Set Theory

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Intersection
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A ½ B = { X \ (X · A) ^(X

· B)}

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Example.
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A = { 1,2,4}

B = { 2,4,6,7}

A ½ B = { 2,4}

Note: The definition for intersection says that in order for an element to be part of the solution set for A ½ B it must be both an element of A and an element B. The definition of the conjunction “and” also requires that both statements, p and q be true.