Hi, I have a question about martingale with respect to Brownian motion process, and I am looking for a detailed explanation. Thank you.© BrainMass Inc. brainmass.com October 10, 2019, 1:04 am ad1c9bdddf
Let be a probability space with a filtration .
Let be a standard one-dimensional - Brownian motion .
Let be a constant.
Prove that the process is and -martingale, where defined by:
Hint: You may use Ito's formula and Ito's isometry.
There are two ways to solve this problem. I'll demonstrate both approaches. The first one is to use "loose" definition of the martingale a s a drift ...
Ito's formula and Ito's isometry are applied.