Let (B) be a Brownian motion and let (widehat{B}_{t}=B_{t}-int_{0}^{t} d s frac{B_{s}}{s}). Prove that for every (t),

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Let \(B\) be a Brownian motion and let \(\widehat{B}_{t}=B_{t}-\int_{0}^{t} d s \frac{B_{s}}{s}\).

Prove that for every \(t\), the r.v's \(B_{t}\) and \(\widehat{B}_{t}\) are not correlated, hence are independent. However, clearly, the two Brownian motions \(B\) and \(\widehat{B}\) are not independent. There is no contradiction with our previous discussion, as \(\widehat{B}\) is not an \(\mathbf{F}^{B}\)-Brownian motion.

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Mathematical Methods For Financial Markets

ISBN: 9781447125242

1st Edition

Authors: Monique Jeanblanc, Marc Yor, Marc Chesney

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