Let W(x) be a real-vlued function defined on a (possibly infinite) interval T⊆R containing 0 that is continuous everywhere differentiable nowhere on T.
Define the sequence of function fn:T→R as follows:
f0(x)≜W(x) and fn(x)≜∫x0fn−1(u)du for n=1,2,3,4,5,... .
Then it follows the fact that fn is differentiable exactly n-times everywhere on T.
Question:
Does there exist such W(x) and T so that the sequence of function fn on T "converges" to a limit function f∞ on T with f∞ being infinitely many times differentiable (i.e., smooth) on T?
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