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Sets and relations

Sets

Any defined collection of items with something in common

Relationship

A relationship is how items of a set relate to each other. Most often used to define a subset within a group

Language of sets

If the set has only a few members you can write all the elements between curly brackets eg. P = {Peter, John, Paul}

If there is a clear pattern you can use three eclipses (dots) eg. S = {2, 4, 6, 8…}

N = Natural numbers

W = Whole numbers

J = Intergers

Q = Rational numbers

R = Real numbers

Subsets

Subsets are equal to their sets, so A=B and B=A

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