For a proof of a existence of definite integral for a monotone function it is noted that if a function is a constant then it has a definite integral. Why?
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2Apply the definition and note how simple the terms are because $f$ is constant. – Randall May 28 '19 at 18:21
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1Perhaps definitive -> definite ? – GEdgar May 28 '19 at 18:26
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Surely a constant is definitively monotone? – copper.hat May 28 '19 at 18:47
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Darboux sums work trivially. – herb steinberg May 28 '19 at 19:04