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noun, Mathematics.
a set function that upon operating on the union of a countable number of disjoint sets gives the same result as the sum of the functional values of each set.


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  • Count against

    verb 1. (intransitive, preposition) to have influence to the disadvantage of: your bad timekeeping will count against you Be disadvantageous to, as in His earnings this year will count against his Social Security benefits. This idiom uses count in the sense of “make a reckoning,” in this case negative. [ Early 1900s ]

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    /ˈkaʊntˌbæk/ noun 1. a system of deciding the winner of a tied competition by comparing earlier points or scores

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