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Sep 11, 2017 at 5:29 vote accept user123043
Sep 10, 2017 at 1:12 comment added Iosif Pinelis Since $f$ is decreasing and concave, it is indeed easy to find the simple expression for the modulus of continuity of continuity.
Sep 9, 2017 at 6:22 comment added user123043 Very thanks for your answer! Then, the value of the modulus of continuity, in this case, is due to "f is decreasing and concave"?
Sep 8, 2017 at 21:24 history edited Iosif Pinelis CC BY-SA 3.0
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Sep 8, 2017 at 19:47 history answered Iosif Pinelis CC BY-SA 3.0