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Integration limits doubt

  1. Apr 5, 2014 #1
    I saw in a question related to Signals and systems that the limits were taken from 5- to 10+ where the signs were in the feet of the numbers..lol..i don't know what you call that. What does this mean?
     
  2. jcsd
  3. Apr 5, 2014 #2

    Simon Bridge

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    You mean like: $$y=\int_{5_-}^{10_+}f(x)dx$$ ?

    Can you provide a reference or a context?
     
    Last edited: Apr 5, 2014
  4. Apr 5, 2014 #3

    Mark44

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    This is not a precalc question. I am moving it to the General Math sections.
     
  5. Apr 5, 2014 #4

    Mark44

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    This would make more sense if the integral were written like this:

    $$\int_{5^+}^{10^-}f(x)dx$$

    That would indicate that there were discontinuities at 5 and 10. To evaluate such an integral, you need to break the integral into two integrals, and use limits at the problem points.

    As stated in post #1, this doesn't make much sense to me.
     
  6. Apr 5, 2014 #5

    mathman

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    Unless there are delta functions at x = 5 or x = 10, the + or - subscripts on the limits have no effect.
     
  7. Apr 5, 2014 #6

    Mark44

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    Before we postulate further on what the question is asking, we should wait for the OP to return to clarify the question.
     
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