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Weierstrass function

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function that is continuous everywhere but differentiable nowhere

Wikidata facts

Named after
Karl Weierstraß
Image
WeierstrassFunction.svg
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Commons category
Weierstrass function
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WikiProject Mathematics
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Weierstrass functions
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Encyclopedic overview

Plot of Weierstrass function over the interval [−2, 2]. Like some other fractals, the function exhibits self-similarity: every zoom (red circle) is similar to the global plot.

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

Excerpted from Wikipedia’s “Weierstrass function” article, available under the CC BY-SA 4.0 licence.