# What does it mean to be nowhere differentiable?

## What does it mean to be nowhere differentiable?

A function f:S⊆R→R f : S ⊆ ℝ → ℝ is said to be nowhere differentiable. if it is not differentiable at any point in the domain S of f . It is easy to produce examples of nowhere differentiable functions.

### Is it possible for a function to be differentiable nowhere?

In mathematics, the Weierstrass function is an example of a real-valued function that is continuous everywhere but differentiable nowhere. It is an example of a fractal curve. It is named after its discoverer Karl Weierstrass.

#### Can zero be differentiable?

Zero is a constant value. We know that differentiation of a constant ks zero. Thus, zero is differentiable.

Is a function is only differentiable when it is non zero?

Differentiability in higher dimensions If all the partial derivatives of a function exist in a neighborhood of a point x0 and are continuous at the point x0, then the function is differentiable at that point x0. is not differentiable at (0, 0), but again all of the partial derivatives and directional derivatives exist.

Is weierstrass function Lipschitz?

Continuous and nowhere Lipschitz An example is given by the Weierstrass function, which is continuous and nowhere differentiable. This can be justified in two ways: A Lipschitz function is differentiable almost everywhere, by Rademacher’s theorem.

## What is a non differentiable function?

A function is non-differentiable when there is a cusp or a corner point in its graph. For example consider the function f(x)=|x| , it has a cusp at x=0 hence it is not differentiable at x=0 . This happens when there is a vertical tangent line at that point.

### Is there a function with no derivative?

No, there aren’t such functions, as there is an algorithm to compute the symbolic derivative.

#### How do you prove something is differentiable?

A function is said to be differentiable if the derivative of the function exists at all points in its domain. Particularly, if a function f(x) is differentiable at x = a, then f′(a) exists in the domain. Let us look at some examples of polynomial and transcendental functions that are differentiable: f(x) = x4 – 3x + 5.

How do you show that a function is not differentiable?

A function is not differentiable at a if its graph has a vertical tangent line at a. The tangent line to the curve becomes steeper as x approaches a until it becomes a vertical line. Since the slope of a vertical line is undefined, the function is not differentiable in this case.

What is non differentiable?

A function that does not have a differential. For example, the function f(x)=|x| is not differentiable at x=0, though it is differentiable at that point from the left and from the right (i.e. it has finite left and right derivatives at that point).

## What makes something differentiable?

A function is formally considered differentiable if its derivative exists at each point in its domain, but what does this mean? It means that a function is differentiable everywhere its derivative is defined. So, as long as you can evaluate the derivative at every point on the curve, the function is differentiable.

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