Etymology

Bayes' theorem

Today it means: A theorem expressed as an equation that describes the conditional probability of an event or state given prior knowledge of another event. Full definition →

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The story

Named after English mathematician Thomas Bayes (1701–1761), who developed an early formulation. The modern expression of the theorem is due to Pierre-Simon Laplace, who extended Bayes's work but was apparently unaware of it.

Etymology from Wiktionary, CC BY-SA 4.0.