# Probability that W(t) = 0 (Calculating inverse Gaussian double integral)

#### sweetpotatofry

##### New Member
I'm working on a problem that asks for the probability that a standard Brownian motion = 0 for some time t between t0 and t1, and I'm stuck on proving this last part -

Any help would be greatly appreciated. Thanks.

#### Martingale

##### TS Contributor
I'm working on a problem that asks for the probability that a standard Brownian motion = 0 for some time t between t0 and t1, and I'm stuck on proving this last part -

Any help would be greatly appreciated. Thanks.

convert to polar coordinates then integrate.