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 February 9th, 2019, 02:28 AM #1 Newbie   Joined: Jan 2019 From: Athens Posts: 5 Thanks: 0 Help with a mathematical proof I am trying to solve the following problem, Function.jpg https://drive.google.com/file/d/1LnR...ew?usp=sharing any help will be appreciated. Last edited by skipjack; February 9th, 2019 at 04:48 AM.
 February 9th, 2019, 02:45 AM #2 Math Team   Joined: Dec 2013 From: Colombia Posts: 7,658 Thanks: 2635 Math Focus: Mainly analysis and algebra The definition of the derivative can be written $$F'(y)=\lim_{x \to y} \frac{F(x)-F(y)}{x-y}$$ so what can you say about $|F'(y)|$? Whatever you can say is true for all values of $y$.

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