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### 15 Cards in this Set

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 Singleton Set a set having exactly 1 element Set any collection of objects or elements Subset A is a subset of B IFF every element of A is also in B Union of 2 Sets union of 2 sets A and B is the set of all elements that are in set A or B Intersection of 2 Sets elements that are in set A and B Disjoint 2 sets with no elements in common. 2 sets A and B are disjoint if their intersection is empty Solution Set set of all elements from the domain that make the statement true. Empty Set a set that has no elements Natural Numbers numbers as you would count. {1,2,3,...) Whole Numbers Natural numbers plus {0} Integers whole numbers plus negatives. Opposites 2 numbers that have a sum of 0 Rational Numbers any number that can be written as a ratio of 2 integers but the demoninator cannot be 0. all repeating decimals are rational. Irrational Numbers non-terminating, non-repeating decimals like the square root of 2 or Pi. all non-perfect squares are irrational. Real Numbers Rational numbers in union with(in addition to) irrational numbers