Math.
a set function that upon operating on the union of a finite number of disjoint sets gives the same result as the sum of the functional values of each set. Cf. countably additive function .
Math.
a set function that upon operating on the union of a finite number of disjoint sets gives the same result as the sum of the functional values of each set. Cf. countably additive function .
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012