Difference between revisions of "Knopp function"
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Latest revision as of 03:31, 27 October 2016
Let $a \in (0,1)$ $ab > 1$. Define the Knopp function $K \colon \mathbb{R} \rightarrow \mathbb{R}$ by $$K_{a,b}(x)=\displaystyle\sum_{k=0}^{\infty} a^k \mathrm{dist}_{\mathbb{Z}} \left( b^k x \right),$$ where $\mathrm{dist}_{\mathbb{Z}}$ denotes the distance to integers function.
Properties
Knopp function is continuous
Knopp function is nowhere differentiable
See Also
Takagi function
van der Waerden function
