Honors Geometry Lesson One

set

set

a collection of objects

element

something contained in a set

set-builder notation

A={x/ x is a...} or A={0<x<10/ where x is a...}

empty set

a set containing no elements

subset

every element in set A is also an element in set B

proper subset

B is a subset of A, but B is not equal to A

equivalent set

Sets containing the same number of elements

union

the union of a and b, A U B, denotes the set combining all of the elements in both given sets

intersection

the intersection of a and b, A n B, denotes the set containing the common elements of the given sets

compliment

the compliment of C, C', contains all the elements in the universal set that are not in C

equal sets

Sets containing the same elements