definition of a set math 101

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set-builder notation

A notation used to describe the elements of a set A={x|x is all numbers less than 10}

Listing

A={1,3,5,7,9}

word description

Describing the members of the set using words, A={all the numbers less than 10}

Cardinal elements of a set

The number of elements of a set

repeated element

counts as one

curly brackets

in mathematics, we write a set by enclosing its elements

universal set

includes all possible choices for a product category

set

is a collection of objects called elements All students enrolled in a course is a set.

well-defined

means that we know exactly what elements belong to the set. not vague

capital letters

names for sets

equal

two sets are _____ if they contain the same elements


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