Results 331 to 340 of about 5,889,360 (355)

Positive definiteness is not enough

Mathematical Geology, 1992
Geostatisticians know that the mathematical functions chosen to represent spatial covariances and variograms must have the appropriate type of positive definiteness, but they may not realize that there are restrictions on the types of covariances and variograms that are compatible with particular distributions.
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Positive Definite Matrices

The American Mathematical Monthly, 1970
(1970). Positive Definite Matrices. The American Mathematical Monthly: Vol. 77, No. 3, pp. 259-264.
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Strict positive definiteness under axial symmetry on the sphere

Stochastic environmental research and risk assessment (Print), 2020
Pier Giovanni Bissiri, A. Peron, E. Porcu   +2 more
semanticscholar   +1 more source

On a criterion of positive definiteness

1997
Let s(x) be a continuous function on (-a, a) such that (i) s(x) = s(-x) for -a 0, then there exists a neighborhood of 0 such that s(x) is positive definite in this neighborhood and admits more than one positive definite continuation from this neighborhood onto the whole real axis.
V. P. Potapov, Irina V. Mikhailova
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Further Study on Z-Eigenvalue Localization Set and Positive Definiteness of Fourth-Order Tensors

, 2020
Linxuan Sun, Gang Wang, Lixia Liu
semanticscholar   +1 more source

Sibling Position and Definition of Self

The Journal of Social Psychology, 1971
(1971). Sibling Position and Definition of Self. The Journal of Social Psychology: Vol. 84, No. 2, pp. 307-308.
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On Positive-Definite Functions [PDF]

Proceedings of the London Mathematical Society, 1956
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Strict positive definiteness in geostatistics

Stochastic environmental research and risk assessment (Print), 2018
S. Iaco, D. Posa
semanticscholar   +1 more source

Checkable Criteria for the M-Positive Definiteness of Fourth-Order Partially Symmetric Tensors

Bulletin of the Iranian Mathematical Society, 2019
Suhua Li, Yaotang Li
semanticscholar   +1 more source

A definition of positivity and negativity

2019
In the last chapter we got a first glance at the positivist thesis. In its formulation, an operator was employed, symbolized by “+” in the upper right of the sentence it applies to. This operator might be read as “it is positively the case that”.
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