martingale(redirected from martingales)
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1. a strap from the reins to the girth of a horse preventing it from carrying its head too high
2. any gambling system in which the stakes are raised, usually doubled, after each loss
a. a chain or cable running from a jib boom to the dolphin striker, serving to counteract strain
b. another term for dolphin striker
A sequence of random variables x1, x2, …, where the conditional expected value of xn + 1given x1, x2, …, xn , equals xn .