sum calculus (sumkal kulus)

That part of the calculus of finite differences which treats of summation. Sumerian, Sumir, Sumirian (sūmē'ri-an, sü'mir, sū-mir'i-an), n. See Accadian. 6055 any particular locality, by the summation therein of a number of tensions, each incapable alone of provoking an actual discharge. W. James, Prin. of Psychol., I. 563. Summation of series, in math. See series. Summation of stimuli, the phenomenon of the production of mental effects by iterated stimuli which a single one would not produce.