# Is A Function Differentiable At A Removable Discontinuity?

## Can a discontinuous function have a limit?

A finite discontinuity exists when the two-sided limit does not exist, but the two one-sided limits are both finite, yet not equal to each other.

The graph of a function having this feature will show a vertical gap between the two branches of the function.

The function f(x)=|x|x has this feature..

## How do you know if a function is continuous?

If a function f is only defined over a closed interval [c,d] then we say the function is continuous at c if limit(x->c+, f(x)) = f(c). Similarly, we say the function f is continuous at d if limit(x->d-, f(x))= f(d).

## Can a function be differentiable at a discontinuity?

It is possible for a differentiable function to have discontinuous partial derivatives. An example of such a strange function is f(x,y)={(x2+y2)sin(1√x2+y2) if (x,y)≠(0,0)0 if (x,y)=(0,0).

## What is the difference between removable and nonremovable discontinuity?

Explanation: Geometrically, a removable discontinuity is a hole in the graph of f . A non-removable discontinuity is any other kind of discontinuity. (Often jump or infinite discontinuities.)

## What does it mean for a function to be differentiable?

A function is differentiable at a point when there’s a defined derivative at that point. This means that the slope of the tangent line of the points from the left is approaching the same value as the slope of the tangent of the points from the right.

## What are the 3 types of discontinuity?

Continuity and Discontinuity of Functions Functions that can be drawn without lifting up your pencil are called continuous functions. You will define continuous in a more mathematically rigorous way after you study limits. There are three types of discontinuities: Removable, Jump and Infinite.

## Does discontinuity mean not differentiable?

According to the book, the function shouldn’t be differentiable at x=0 as it has a discontinuity (continuity is a necessary condition of differentiability).

## Why is it called removable discontinuity?

The reason it’s called “removable” is that we can remove this type of discontinuity as follows: define g(x) such that g(a)=limx→af(x), and g(x)=f(x) everywhere else. Then g(x) is continuous at x=a. Which of the following functions have a removable discontinuity (at any point)?

## Can a piecewise function be continuous?

The piecewise function f(x) is continuous at such a point if and only of the left- and right-hand limits of the pieces agree and are equal to the value of the f. …

## What does it mean for a function to be continuous?

In mathematics, a continuous function is a function that does not have any abrupt changes in value, known as discontinuities. More precisely, sufficiently small changes in the input of a continuous function result in arbitrarily small changes in its output. If not continuous, a function is said to be discontinuous.

## Can you differentiate a removable discontinuity?

So, no. If f has any discontinuity at a then f is not differentiable at a .

## What is a removable discontinuity provide an example?

For example, this function factors as shown: After canceling, it leaves you with x – 7. Therefore x + 3 = 0 (or x = –3) is a removable discontinuity — the graph has a hole, like you see in Figure a.

## How do you know if a function is continuous on an interval?

A function is said to be continuous on an interval when the function is defined at every point on that interval and undergoes no interruptions, jumps, or breaks. If some function f(x) satisfies these criteria from x=a to x=b, for example, we say that f(x) is continuous on the interval [a, b].

## How do you prove a function is continuous?

How to Determine Whether a Function Is Continuousf(c) must be defined. The function must exist at an x value (c), which means you can’t have a hole in the function (such as a 0 in the denominator).The limit of the function as x approaches the value c must exist. … The function’s value at c and the limit as x approaches c must be the same.

## How do you determine if a function is differentiable at a point?

Lesson 2.6: Differentiability: A function is differentiable at a point if it has a derivative there. … Example 1: … If f(x) is differentiable at x = a, then f(x) is also continuous at x = a. … f(x) − f(a) … (f(x) − f(a)) = lim. … (x − a) · f(x) − f(a) x − a This is okay because x − a �= 0 for limit at a. … (x − a) lim. … f(x) − f(a)More items…

## Which function has a removable discontinuity?

A function f has a removable discontinuity at x = a if the limit of f(x) as x → a exists, but either f(a) does not exist, or the value of f(a) is not equal to the limiting value. If the limit exists, but f(a) does not, then we might visualize the graph of f as having a “hole” at x = a.