I'm trying to think of a function which is Lipschitz but which fails to be differentiable at a dense set of points. Of course, being a Lipschitz function it will be differentiable almost everywhere, but can we make it so that the function is not differentiable at every rational point (for instance)?
2026-03-03 00:16:09.1772496969
Lipschitz function which fails to be differentiable on a dense set
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