English Axiom of countable choice Cited by user Thatsme314 on 18 Jul 2023 The axiom of countable choice or axiom of denumerable choice, denoted ACω, is an axiom of set theory that states that every countable collection of non-empty sets must…
English Vitali set Cited by user Citation bot on 19 Mar 2022 In mathematics, a Vitali set is an elementary example of a set of real numbers that is not Lebesgue measurable, found by Giuseppe Vitali in 1905.