Tuesday, 18 July 2017

calculus - Monotonic function non-continuous in each rational

How can I prove that exists a monotonic non-decreasing function f:[0,1]R that isn't continuous in every rational of its domain?

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real analysis - How to find limhrightarrow0fracsin(ha)h

How to find limh0sin(ha)h without lhopital rule? I know when I use lhopital I easy get $$ \lim_{h\rightarrow 0}...