Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
 adjective Of, relating to, or being a quantity that is either positive or zero.
from Wiktionary, Creative Commons Attribution/ShareAlike License.
 adjective mathematics (of a quantity) Not negative; either
zero orpositive  noun Any value that is not negative.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
 adjective either positive or zero
Etymologies
from Wiktionary, Creative Commons Attribution/ShareAlike License
Examples

Now the covariance matrix can be written as where T is the transpose, U is an orthogonal matrix (, I is an identity matrix), D is a diagonal matrix matrix of eigenvalues (nonnegative numbers).

S and R are real, with R nonnegative, and rewriting SchrÃ¶dinger's equation in terms of these new variables to obtain a pair of coupled evolution equations: the continuity equation for Ï = R2 and a modified HamiltonJacobi equation for S, differing from the usual classical HamiltonJacobi equation only by the appearance of an extra term, the quantum potential

Now, to a mathematician (and I am one of those), a metric is a nonnegative function of two points in a metric space (socalled because it is a set on which a metric is defined) that tells something about how far apart (often in quite nonintuitive ways) the two points are.

Now, to a mathematician (and I am one of those), a metric is a nonnegative function of two points in a metric space (socalled because it is a set on which a metric is defined) that tells something about how far apart (often in quite nonintuitive ways) the two points are.

Now, to a mathematician (and I am one of those), a metric is a nonnegative function of two points in a metric space (socalled because it is a set on which a metric is defined) that tells something about how far apart (often in quite nonintuitive ways) the two points are.

Now, to a mathematician (and I am one of those), a metric is a nonnegative function of two points in a metric space (socalled because it is a set on which a metric is defined) that tells something about how far apart (often in quite nonintuitive ways) the two points are.

The whole numbers are also called the positive integers (or the nonnegative integers, if zero is included).

The conceptual basis for the nonnegative integers was purely intuitive, but they had been in use for untold centuries and had achieved cultural acceptability — that is, as meeting the demands of the rigor of the day.

To each of these integers corre  sponds a nonnegative number pi between 0 and 1 such that the sum of all these pi equals 1.

NET statistics library that provides functions for statistical computation and biostatistics, including descriptive statistics, probability distributions, linear regression, hypothesis testing, ANOVA, multivariate statistics, partial least squares, clustering, and nonnegative matrix factorization (NMF).
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