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10 votes
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For this continuous non differentiable function $f$ How to determine $\sup\{a\}$ s.t $\lim\l...

I leave my proof below, although as user479223 mentions, this is the same as showing Hölder continuity of the Weierstrass function, which is well known (see this MSE answer). …
Daniele Tampieri's user avatar
33 votes
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What is the smallest set of real continuous functions generating all rational numbers by ite...

It is enough with one continuous function. First, I'll give a simple example with one function which is discontinuous at one point. To do it, consider the function $$f:(0,\pi+1)\to(0,\pi+1)$$ with $$ …
Saúl RM's user avatar
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