Welcome to European Tribune. It's gone a bit quiet around here these days, but it's still going.
Why does a degree have to be "useful"? IMHO, that's just an Anglo-Diseased point of view.

$E(X_t|F_s) = X_s,\quad t > s$
by martingale on Thu Apr 2nd, 2009 at 11:49:06 PM EST
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