Let I ~ R be an interval and let I : I -+ R be increasing on I. If c is not an endpoint
Chapter 5, Problem 7(choose chapter or problem)
Let I ~ R be an interval and let I : I -+ R be increasing on I. If c is not an endpoint of I, show that the jump j 1 (c) off at cis given by inf{l(y)- l(x): x < c < y, x, y e I}.
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