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Brownian motion. Nondifferentiability of paths. The stochastic integral and the Ito isometry.
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Stochastic integral of complex-valued processes. Levy's characterization of a multidimensional Brownian motion.
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General definition and properties of stochastic integral.
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Multidimensional stochastic integrals and Ito processes. Quadratic variation and cross variation.
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Definition of local martingale. Construction of the stochastic integral for a process with locally square integrable sample paths.
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Stopped stochastic processes. A stopped continuous martingale is a martingale. Properties of stopped stochastic integrals.
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Multidimensional stochastic integrals: definition, linearity, mean and covariance matrix, martingale property, cross-variation.
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Stochastic integral with respect to an Ito process. The Ito-Doeblin formula. Quadratic variation of an Ito process.
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Stochastic integrals of simple processes. Stochastic integral of Brownian motion.
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The partition property. Covariance and conditional covariance of stochastic integrals.
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The stochastic integral is a continuous martingale.
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The space M^2([0,T]). General definition of stochastic integral as a L^2 limit. Quadratic variation of a stochastic integral.
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