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Description
In mathematics, a limit is the value that a function (or sequence) "approaches" as the input (or index) "approaches" some value. Limits are essential to calculus (and mathematical analysis in general) and are used to define continuity, derivatives, and integrals.
The concept of a limit of a sequence is further generalized to the concept of a limit of a topological net, and is closely related to limit and direct limit in category theory.
In formulas, a limit of a function is usually written as
lim
x
→
c
f
(
x
)
=
L
,
{\displaystyle \lim _{x\to c}f(x)=L,}
and is read as "the limit of f of x as x approaches c equals L". The fact that a function f approaches the limit L as x approaches c is sometimes denoted by a right arrow (→), as in
f
(
x
)
→
L
as
x
→
c
.
{\displaystyle f(x)\to L{\text{ as }}x\to c.}
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