什么是Girsanov’s theorem

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什么是Girsanov’stheorem什么是Girsanov’stheorem什么是Girsanov’stheorem一个概率学里面的定理,没学过,没看懂Inprobabilitytheory,th

什么是Girsanov’s theorem
什么是Girsanov’s theorem

什么是Girsanov’s theorem
一个概率学里面的定理,没学过,没看懂
In probability theory,the Girsanov theorem tells how stochastic processes change under changes in measure.The theorem is especially important in the theory of financial mathematics as it tells how to convert from the physical measure which describes the probability that an underlying instrument (such as a share price or interest rate) will take a particular value or values to the risk-neutral measure which is a very useful tool for evaluating the value of derivatives on the underlying.

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