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Sets, Intersections, and Unions
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Key Concepts:
Terms in this set (15)
Set
a collection of items
Element
each item in a set
Finite Set
countable items
Order
number of elements in a set
Infinite Set
uncountable items
subset
smaller set in a larger one
Empty Set
{ }
Intersection "And"
elements in both sets
Union "Or"
combines sets
Whole Numbers
Natural numbers ( counting numbers) and zero; 0, 1, 2, 3...
Natural Numbers
The set of numbers 1, 2, 3, 4, ... Also called counting numbers.
Integers
The set of whole numbers and their opposites
Rational Numbers
Any number that can be expressed as a fraction
irrational numbers
Numbers that cannot be expressed as a ratio of two integers. Their decimal expansions are nonending and nonrepeating.
real numbers
the set of all rational and irrational numbers
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