Saturday, 8 June 2013

real analysis - Using mean value theorem and Rolle's theorem to prove an inequality

f is a continuous function on
[0,+) and differentiable on (0,+), and f is strictly decreasing on (0,+)



the question is: is this inequality true for each (a,b) ([0,+))2 such as $a

(b-a)f(b)\leqslant f(b)-f(a) \leqslant (b-a)f(a)



I've tried to prove that \forall x \in {[}a,b{]} : f(b)\leqslant f'(x)\leqslant f(a) so I can apply the mean value theorem
on {[}a,b{]}

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