Non-real Integrals...

**Also sprach Zarathustra** · May 14th 2010, 07:52 AM

Check if the next non-real integral convergent without computing.

int (1-->inf) e^(-sqrt(x))

Thanks!

**zzzoak** · May 14th 2010, 06:41 PM

$\int e^{-\sqrt x}dx=$
$(x=t^2 \: \: dx=2tdt)$
$=\int e^{-t}2tdt$

**HallsofIvy** · May 15th 2010, 02:13 AM

Originally Posted by Also sprach Zarathustra

Check if the next non-real integral convergent without computing.

int (1-->inf) e^(-sqrt(x))

Thanks!

In what sense is this "non-real"? Did you mean "improper integral"?

**Also sprach Zarathustra** · May 15th 2010, 05:45 AM

Originally Posted by HallsofIvy

In what sense is this "non-real"? Did you mean "improper integral"?

Yes, I'm translated this from Hebrew, sorry.

**HallsofIvy** · May 15th 2010, 02:28 PM

Originally Posted by Also sprach Zarathustra

Yes, I'm translated this from Hebrew, sorry.

Not a problem. My Hebrew (or just about any other language is far worse than your English, I am sure.

Thread: Non-real Integrals...