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$E(X_t|F_s) = X_s,\quad t > s$
by martingale on Wed Sep 24th, 2008 at 01:46:04 AM EST
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Thanks.

A vivid image of what should exist acts as a surrogate for reality. Pursuit of the image then prevents pursuit of the reality -- John K. Galbraith
by Migeru (migeru at eurotrib dot com) on Wed Sep 24th, 2008 at 02:17:39 AM EST
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