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→Dirichlet function: correction of the double-limit definition |
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The ''Dirichlet function'' can be constructed as the double pointwise limit of a sequence of continuous functions, as follows:
:<math>f(x)=\lim_{k\to\infty}\left(\lim_{j\to\infty}\left(\cos(k!\pi x)\right)^{2j}
for integer ''j'' and ''k''.
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