complement of a set
The complement of a set is defined and shown through numerous examples. Alternate notations for complement are presented. Set-builder notation and Venn diagrams are included. Connections are made to the real world.
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differents kinds of sets
Three different kinds: none, one and infinitely many.
The theory of numbers is based on the property of sets of different kinds of numbers.
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Closed sets and open sets, or finite and infinite sets.