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# Chap 3 Vocab

TermDefinition
complement of a set the set of all elements in the universal set that are not in a given set. the complement of rolling a 1 or 2 on a number cube is rolling a 3,4,5, or 6.
compound inequality two inequalities that are joined by and or a or. 5
disjoint sets sets that do not have any elements in common. the set of positive integers and the set of negative integers are disjoined sets.
empty sets a set that does not contain any elements. the intersection of the set of positive integers and the set of negative integers is the empty set.
equivalent inequalities inequalities that have the same set of solutions. x+4<7 and x<3 are equivalent inequalities.
intersection the set of elements that are common to two or more sets. if C= (1,2,3,4)and D=(2,4,6,8), then the intersection of C and D, or CnD, is (2,4).
interval notation a notation for describing an interval on a number line. the intervals endpoint(s) are given, and a parenthesis or bracket is used to indicate whether each endpoint is included in the interval. for -2
roster form a notation for listing all of the elements in a set using set braces and commas. the set of prime number less than 10, expressed in roster form, is {2,3,5,7}.
set-builder notation a notation used to describe the elements of a set.
Solution of an inequality the numbers you replace with the variables with to make a true sentence. X<-2 x could be anything less than -2 to make a true sentence.
union the set that contains all of the elements of two or more sets. if A= {1,5,10}, then the union of A and B, or A u B, is {1,3,5,6,9,10}.
universal set The set of all possible elements from which subsets are formed.
Created by: lazyperson