# optional stopping theorem

> martingale's expected value at a stopping time equals its initial expected value

**Wikidata**: [Q2027347](https://www.wikidata.org/wiki/Q2027347)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Optional_stopping_theorem)  
**Source**: https://4ort.xyz/entity/optional-stopping-theorem


## References

1. Freebase Data Dumps. 2013
2. [OpenAlex](https://docs.openalex.org/download-snapshot/snapshot-data-format)