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Montreal Math Club

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 Proposed by Vincentiu Radulescu, University of Craiova, Romania

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Mohammad
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Mohammad


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Proposed by Vincentiu Radulescu, University of Craiova, Romania Empty
PostSubject: Proposed by Vincentiu Radulescu, University of Craiova, Romania   Proposed by Vincentiu Radulescu, University of Craiova, Romania EmptyTue Feb 23, 2010 4:16 pm

Prove that there does not exist a positive, twice differentiable function f:[0,\infty)\to R such that f(x)f"(x)+1\leq 0 for all x\geq 0. bounce
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Proposed by Vincentiu Radulescu, University of Craiova, Romania
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