un-summable

summable

[suhm-uh-buhl]
adjective Mathematics.
1.
capable of being added.
2.
(of an infinite series, especially a divergent one) capable of having a sum assigned to it by a method other than the usual one of taking the limit of successive partial sums.
3.
(of a function) possessing a finite Lebesgue integral.

Origin:
1775–85; sum + -able

summability, noun
unsummable, adjective
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