# Problem Solving

## CONTENTS OF CURRICULUM UNIT 80.07.04

## Logic and Set Theory

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Union
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A U B = {X \(X · A) V(X ·B)}

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Example.
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A = { 1,2,3}

B = { 4,5,6}

AUB = {1,2,3,4,5,6}

Note: The definition for union says that in order for an element to be part of the solution set for AU B it must only be a member of either set A or of set B. The definition of the disjunction “or” also requires that only one statement p or q be true.