Difference between revisions of "Continuous"

(New page: A property of a function. Definition. A function <math>f: I\to\mathbb R</math>, where <math>I</math> is a real interval, is continuous in the point <math>a\in I</math>, if fo...)
 
m
 
(One intermediate revision by one other user not shown)
Line 5: Line 5:
 
A function is said to be continuous on an interval if it is continuous in each of the interval's points.
 
A function is said to be continuous on an interval if it is continuous in each of the interval's points.
  
An alternative definition using [[limits]] is <math>\lim_{x\to a} f(x) = f(a)</math>.
+
An alternative definition using [[Limit|limits]] is <math>\lim_{x\to a} f(x) = f(a)</math>.
 +
 
 +
{{stub}}

Latest revision as of 11:52, 15 May 2022

A property of a function.

Definition. A function $f: I\to\mathbb R$, where $I$ is a real interval, is continuous in the point $a\in I$, if for any $\varepsilon>0$ there exists a number $\delta$ (depending on $\varepsilon$) such that for all $x\in I\cap (a-\delta, a+\delta) -\{a\}$ we have $|f(x)-f(a)| < \varepsilon$.

A function is said to be continuous on an interval if it is continuous in each of the interval's points.

An alternative definition using limits is $\lim_{x\to a} f(x) = f(a)$.

This article is a stub. Help us out by expanding it.