# Martingale (probability theory)

## Model in probability theory / From Wikipedia, the free encyclopedia

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For the martingale betting strategy, see martingale (betting system).

In probability theory, a **martingale** is a sequence of random variables (i.e., a stochastic process) for which, at a particular time, the conditional expectation of the next value in the sequence is equal to the present value, regardless of all prior values.