Introduction to Stochastic Integration

Name: Introduction to Stochastic Integration
Brand: Springer Nature
SKU: 9780387310572
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Springer Nature

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9780387310572

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In the LeibnizNewton calculus, one learns the di?erentiation and integration of deterministic functions. A basic theorem in di?erentiation is the chain rule, which gives the derivative of a composite of two di?erentiable functions. The chain rule, when written in an inde?nite integral form, yields the method of substitution. In advanced calculus, the RiemannStieltjes integral is de?ned through the same procedure of partition-evaluation-summation-limit as in the Riemann integral. In dealing with random functions such as functions of a Brownian motion, the chain rule for the LeibnizNewton calculus breaks down. A Brownian motionmovessorapidlyandirregularlythatalmostallofitssamplepathsare nowhere di?erentiable. Thus we cannot di?erentiate functions of a Brownian motion in the same way as in the LeibnizNewton calculus. In 1944 Kiyosi It o published the celebrated paper Stochastic Integral in the Proceedings of the Imperial Academy (Tokyo). It was the beginning of the It o calculus, the counterpart of the LeibnizNewton calculus for random functions. In this six-page paper, It o introduced the stochastic integral and a formula, known since then as It os formula. The It o formula is the chain rule for the Itocalculus.Butitcannotbe expressed as in the LeibnizNewton calculus in terms of derivatives, since a Brownian motion path is nowhere di?erentiable. The It o formula can be interpreted only in the integral form. Moreover, there is an additional term in the formula, called the It o correction term, resulting from the nonzero quadratic variation of a Brownian motion.

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