Uh oh! Wolfram|Alpha doesn't run without JavaScript.
Please enable JavaScript. If you don't know how, you can find instructions
here
.
Once you've done that, refresh this page to start using Wolfram|Alpha.
int(1/sigma^(N+M+1)*exp(-1/(2*sigma^2)* r^2))
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random