If 
is a member of a set 
, then 
is said to be an element of 
, written 
. If 
is not an element of 
, this is written 
.
The term element also refers to a particular member of a group, or entry 
in a matrix 
or unevaluated determinant 
.
Element
See also
Over, Set, Set TheoryExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Element." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Element.html