or

or

taken

why

Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.

Don't know
Know
remaining cards
Save
0:01
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

Normal Size     Small Size show me how

# Elem. Set Theory

### As of mathsisfun.com and efgh.com.

TermDefinition
Set Collection of items considered as a whole
Elements Items in a set
Contained in
Not contained in
Null
Subset Every item that is in A is in B
Such that |
Intersection The number of elements that two sets have in common, ∩
Proper subset
Subset
Union All of the elements that are present, ∪
Disjoint No elements in common
Venn diagram Sets are represented as the interiors of overlapping circles
Minus -
Ordered pair Two elements in a specified order
Cross product The set of ordered pairs whose first and second elements are part of A and B, respectively
Relation Set of ordered pairs of elements of A
Obey relation ~
Equivalence Two sets are reflexive, symmetric, and transitive
Reflexive a~a
Symmetric a~b means that b~a
Transitive a~b and b~c means that a~c
Partition Subsets are disjoint and union is A
Equivalence classes The sets in a partition associated with an equivalence relation
Created by: Jiboo221