Mathematics
Undergraduate
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f(x)={1 (x∈x0)
{0 (x∈[0,1]\x0)
x0=[0,1]∩Q f:[0,1]→Rが積分不可能であることを示せ。(ただし、有理数と無理数のR上の稠密性は認めて良い。)
という問題の解き方を教えて欲しいです、よろしくお願いします。
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