Show me how this equation is valid

  • Thread starter oahz
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  • #1
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Please, hurry. It's driving me nuts
 

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  • #2
269
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I suppose ##f \geq 0##? If so, ##y\geq x \implies yf(y) \geq xf(y)##.
 
  • #3
158
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Seconded. Note that y takes on every value >= x, so you have basically replaced the constant x with the increasing function y in the integral.
 

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