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What can and cannot be integrated?

Posted on 2006-07-12
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Am I correct to believe that there are certain techniques to identify functions that cannot be integrated indefinitely?

If so: can someone please explain what they are?


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(Points will be upped if there is a solution)
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Question by:InteractiveMind
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There are at leaast two different types of intergals. Riemann and Labegue.
They have different criteria as to the existance of the integral. All functions which are Legesque integrable are Riemann integrable but not vice versa.
Riemann is the most common. If the function is at least peicewise continuous, the definite integral exists. If you want the indefinite integral of an otherwise integable function you have to consider the end points. If one or the other approches infinity too rapidly you are in trouble.
If the function is not continuous (goes to infinity somewhere) it may still be integrable by Riemann techniques. There are various liniting procescess whihc can be used to check for integrableness. See textbooks.
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f(x) = 1 when x is rational, 0 when x is irrational, is Lebesgue integrable but not Riemann integrable
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And here's an example of a set that's not Lebesgue integrable http://en.wikipedia.org/wiki/Banach-Tarski_Paradox
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