a point at which a given function of a complex variable has no derivative but of which every neighborhood contains points at which the function has derivatives.
Does “None” Take A Singular Or Plural Verb?One is singular, and so takes a singular verb ... so "none" should be singular, too? Not so fast. None can take a singular or plural verb. Why?!
Moot Point vs. Mute PointYou may have heard coworkers or acquaintances refer to an inconsequential or irrelevant point as a moot point, or maybe you’ve heard mute point instead. Fans of the TV show Friends may have heard a third variation: moo point (because, according to Joey, a cow’s opinion doesn’t matter). But which expression is correct, and what exactly does it mean? The correct phrase is moot point. …
Origin of singular point
First recorded in 1885–90
Also called singularity.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019