submartingale
English edit
Etymology edit
sub- + martingale
Noun edit
submartingale (plural submartingales)
- (mathematics) A stochastic process for which the conditional expectation of future values given the sequence of all prior values is superior or equal to its current value.
- If a gambler repeatedly plays a game with positive expectation, his payoff over time is a submartingale.
Usage notes edit
- A submartingale is a martingale if and only if it is a submartingale and also a supermartingale.