Skip to main content
removed capitals from title, added link information
Source Link
YCor
  • 63.9k
  • 5
  • 187
  • 286

Malliavin Derivativederivative of Ito Processprocess

Let $X_t= X_0 + \int_0^t \mu(s,X_s)ds + \int_0^t \sigma(s,X_s)dW_s$ where $\mu$ and $\sigma$ are $C^1$ functions satisfying the usual growth restriction and $W_t$ is a $d$-dimensional Brownian motion. Let $f\in C^2(\mathbb{R}^d;\mathbb{R})$ and let $D_t$ denote the Malliavin derivative at time $t$; then how would one go about computing $$ D_tf(X_t) =? $$

So Far: I know that if $X_t= \int_0^t \sigma(s)dW_s$ then by definition 2.2 in definition 2these lectures by D.2 Nualart $$ D_tf(X_t) = \sigma_t^T\left[\frac{\partial f}{\partial x} (X_t)\right]... $$ but what about the general case?

Malliavin Derivative of Ito Process

Let $X_t= X_0 + \int_0^t \mu(s,X_s)ds + \int_0^t \sigma(s,X_s)dW_s$ where $\mu$ and $\sigma$ are $C^1$ functions satisfying the usual growth restriction and $W_t$ is a $d$-dimensional Brownian motion. Let $f\in C^2(\mathbb{R}^d;\mathbb{R})$ and let $D_t$ denote the Malliavin derivative at time $t$; then how would one go about computing $$ D_tf(X_t) =? $$

So Far: I know that if $X_t= \int_0^t \sigma(s)dW_s$ then by definition 2.2 $$ D_tf(X_t) = \sigma_t^T\left[\frac{\partial f}{\partial x} (X_t)\right]... $$ but what about the general case?

Malliavin derivative of Ito process

Let $X_t= X_0 + \int_0^t \mu(s,X_s)ds + \int_0^t \sigma(s,X_s)dW_s$ where $\mu$ and $\sigma$ are $C^1$ functions satisfying the usual growth restriction and $W_t$ is a $d$-dimensional Brownian motion. Let $f\in C^2(\mathbb{R}^d;\mathbb{R})$ and let $D_t$ denote the Malliavin derivative at time $t$; then how would one go about computing $$ D_tf(X_t) =? $$

So Far: I know that if $X_t= \int_0^t \sigma(s)dW_s$ then by definition 2.2 in these lectures by D. Nualart $$ D_tf(X_t) = \sigma_t^T\left[\frac{\partial f}{\partial x} (X_t)\right]... $$ but what about the general case?

Needs new tag...there is surprisingly none on Malliavin Calculus?
Link
Source Link
ABIM
  • 5.4k
  • 3
  • 19
  • 41

Malliavin Derivative of Ito Process

Let $X_t= X_0 + \int_0^t \mu(s,X_s)ds + \int_0^t \sigma(s,X_s)dW_s$ where $\mu$ and $\sigma$ are $C^1$ functions satisfying the usual growth restriction and $W_t$ is a $d$-dimensional Brownian motion. Let $f\in C^2(\mathbb{R}^d;\mathbb{R})$ and let $D_t$ denote the Malliavin derivative at time $t$; then how would one go about computing $$ D_tf(X_t) =? $$

So Far: I know that if $X_t= \int_0^t \sigma(s)dW_s$ then by definition 2.2 $$ D_tf(X_t) = \sigma_t^T\left[\frac{\partial f}{\partial x} (X_t)\right]... $$ but what about the general case?