postulate : Idioms & Phrases
bayes' postulate
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noun (statistics) the difficulty of applying Bayes' theorem is that the probabilities of the different causes are seldom known, in which case it may be postulated that they are all equal (sometimes known as postulating the equidistribution of ignorance)
WordNet
euclid's postulate
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noun (mathematics) any of five axioms that are generally recognized as the basis for Euclidean geometry
Euclid's axiom; Euclidean axiom.