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Stochastic Calculus: An Introduction with Applications
www.math.uchicago.edu;F;P) is a probability space and Yis an integrable random variable. Suppose Gis a sub ˙-algebra of F. Then E[Y jG] is de ned to be the unique (up to an event of measure zero) G-measurable random variable such that if A2G, E[Y1 A] = E[E[Y jG]1 A]: Uniqueness follows from the fact that if Z 1;Z 2 are G-measurable ran-dom variables with E[Z 1 1 A ...