Difference between revisions of "Weierstrass nowhere differentiable function"

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=Properties=
 
=Properties=
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[[Weierstrass function is continuous]]<br />
<strong>Theorem:</strong> The Weierstrass function $f$ is [[continuous]] everywhere but [[derivative|differentiable]] nowhere.
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[[Weierstrass function is nowhere differentiable]]<br />
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<strong>Proof:</strong> █
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=Videos=
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[https://www.youtube.com/watch?v=pCEFZk9Vihs Weierstrass example (17 October 2013)]<br />
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=References=
 
=References=

Latest revision as of 17:54, 25 June 2017

The Weierstrass function is $$f(x)=\displaystyle\sum_{k=0}^{\infty} a^k \cos(b^k\pi x),$$ where $0<a<1$ and $b \in \{1,3,5,7,9,\ldots\}$ such that $ab > 1+\dfrac{3}{2}\pi$.

Properties

Weierstrass function is continuous
Weierstrass function is nowhere differentiable

Videos

Weierstrass example (17 October 2013)

References

[1]