Lebesgue integral
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Let f be defined on the interval [0,1] by setting f(x)=0 if x is irrational, and if x=(m/n) rational where gcd(m,n)=1 set f(x)=n. Show that f is unbounded on every open interval in [0,1] and compute the Lebesgue integral of f over the interval [0,1].
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The expert computes the Lebesgue integral from this case.
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To show that f(x) is unbounded on every open interval in [0,1], we will claim that for every interval (a,b) contained in [0,1], and for every integer number t, we can find a rational number q=r/t with gcd(r,t) = 1 (that is, the fraction r/t is irreducible).
Suppose, to the contrary, that
the set of denominators is bounded from above. That is, there is a constant ...
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