# How do you do a gaussian integral when it contains a heaviside function?

How do you do a gaussian integral when it contains a heaviside function!?

Very few textbooks cover gaussian integrals effectively. This isn't a big deal as they are easy to locate in integral tables, but something I cannot find anywhere is how to handle a gaussian with a heaviside

heaviside = theta

$$\int_0^\infty \theta(v-b)e^{-av^2}dv$$

where b is an arbitrary value of v where the heaviside 'turns on'

If anyone can help shed some light on this for me it would be greatly appreciated.

Last edited:

Meir Achuz
That integral is the error integral $$(\sqrt{\pi}/2)erfc(b)$$.