# How do you know if a limit does not exist on a graph?

## How do you know if a limit does not exist on a graph?

Here are the rules:

1. If the graph has a gap at the x value c, then the two-sided limit at that point will not exist.
2. If the graph has a vertical asymptote and one side of the asymptote goes toward infinity and the other goes toward negative infinity, then the limit does not exist.

Can a graph be continuous if the limit does not exist?

3) a continuous function has a limit at a (in particular, if limx→a f(x) does not exist, f cant be continuous). Types of discontinuity A function can fail to be continuous in a few dif- ferent ways. A jump discontinuity is a point a so that limx→a− f(x) and limx→a+ f(x) both exist, but are not equal.

### How do you show that a limit exists in calculus?

In other words, to show that a limit exists we would technically need to check an infinite number of paths and verify that the function is approaching the same value regardless of the path we are using to approach the point. Luckily for us however we can use one of the main ideas from Calculus I limits to help us take limits here.

When does a limit do not exist in a function?

Remember that limits represent the tendency of a function, so limits do not exist if we cannot determine the tendency of the function to a single point. Graphically, limits do not exist when: The limit does not exist at x = 1 in the graph below.

## What are the limits of a multivariable function?

Implicit Differentiation Derivatives of Inverse Functions 3The Graphical Behavior of Functions Extreme Values The Mean Value Theorem Increasing and Decreasing Functions Concavity and the Second Derivative Curve Sketching

Can you prove that the limit does not exist?

Of course, if you find that all limits along lines are equal, you cannot conclude that the limit exists; instead, you should try along other curves, if you suspect the limit doesn’t exist. What you did is correct, but note that after proving that the limit is 0 when you take y = 0, the fact that it is also 0 when you take x = 0 is irrelevant.