Milnor conjecture (topology): Difference between revisions

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In [[probability theory]], '''Novikov's condition''' is the sufficient condition for a stochastic process which takes the form of the Radon-Nikodym derivative in [[Girsanov's theorem]] to be a martingale. If satisfied together with other conditions, [[Girsanov's theorem]] may be applied to a Brownian Motion [[stochastic process]] to change from the original measure to the new measure defined by the Radon-Nikodym derivative.
 
This condition was suggested and proved by [[Alexander Novikov (professor)|Alexander Novikov]]. There are other results which may be used to show that the Radon-Nikodym derivative is a martingale, such as the more general criterion [[Kazamaki's condition]], however Novikov's condition is the most well-known result.
 
Assume that
<math> (X_t)_{0\leq t\leq T}</math> is a real valued adapted process on the probability space <math> \left (\Omega, (\mathcal{F}_t), \mathbb{P}\right) </math> and <math>(W_t)_{0\leq t\leq T}</math> is an adapted [[Brownian motion]]<ref name=Pasc>Pascucci, Andrea (2011) ''PDE and Martingale Methods in Option Pricing''. Berlin: [[Springer-Verlag]]</ref>{{rp|334}}:
 
If the condition
 
: <math>  
\mathbb{E}\left[e^{\frac12\int_0^T|X_t|^2\,dt}  \right]<\infty
</math>
 
is fulfilled then the process
 
: <math>
  \ Z_t \ = e^{\int_0^t X_s\, dW_s  -\frac{1}{2}\int_0^t X_s^2\, ds},\quad 0\leq t\leq T
</math>
 
is a martingale under the probability measure <math>\mathbb{P}</math> and the filtration <math>\mathcal{F}</math>.
 
==References==
{{reflist}}
Comments on Girsanov's Theorem by H. E. Krogstad, IMF 2003[http://www.math.ntnu.no/~hek/MA8101/GirsanovsTheorem.pdf]
 
[[Category:Stochastic processes]]
[[Category:Martingale theory]]

Latest revision as of 17:05, 16 March 2013

In probability theory, Novikov's condition is the sufficient condition for a stochastic process which takes the form of the Radon-Nikodym derivative in Girsanov's theorem to be a martingale. If satisfied together with other conditions, Girsanov's theorem may be applied to a Brownian Motion stochastic process to change from the original measure to the new measure defined by the Radon-Nikodym derivative.

This condition was suggested and proved by Alexander Novikov. There are other results which may be used to show that the Radon-Nikodym derivative is a martingale, such as the more general criterion Kazamaki's condition, however Novikov's condition is the most well-known result.

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If the condition

𝔼[e120T|Xt|2dt]<

is fulfilled then the process

Zt=e0tXsdWs120tXs2ds,0tT

is a martingale under the probability measure and the filtration .

References

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  1. Pascucci, Andrea (2011) PDE and Martingale Methods in Option Pricing. Berlin: Springer-Verlag