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What is dx mean in intagral?

  1. Jun 19, 2007 #1
    What is dx mean in intagral?
     
    Last edited: Jun 19, 2007
  2. jcsd
  3. Jun 19, 2007 #2

    malawi_glenn

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    that x is the variable that you perform the integral over. Variable of integration.

    It comes from the defintion of integral, that you sum over the function value multiplying it with a very very small x-intervall (length multiplied with height). Riemann summary. If we make the intervall infinitesimal (dx), the we have to do, in practice, an infinite amount of summations over these "function value" * "length of intervall"

    http://en.wikipedia.org/wiki/Integral
     
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