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f(x) = 1 if x is rational

f(x) = 0 if x is irrational

But there is no specific question about this function. It is a well defined function whose domain is the real numbers and whose codomain consists of the two values, 0 and 1.

It is a function with infinitely many discontinuities, and an integral which is 0.

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13y ago

What else can I help you with?