Results 11 to 20 of about 15,388 (303)
Positivity preserving hadamard matrix functions [PDF]
Positivity, 2007 Bhatia R, Elsner L. Positivity preserving hadamard matrix functions. Positivity. 2007;11(4):583-588.For every positive real number p that lies between even integers 2(m-2) and 2(m-1) we demonstrate a matrix A = [a(ij)] of order 2m such that A is positive
Elsner, Ludwig +3 more
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The $L^\infty$-positivity preserving property and stochastic completeness
Potential Analysis, 2021 We say that a Riemannian manifold satisfies the $L^p$-positivity preserving property if $(-\Delta + 1)u\ge 0$ in a distributional sense implies $u \ge 0$ for all $ u \in L^p$.While geodesic completeness of the manifold at hand ensures the $L^p ...
Bisterzo, Andrea, Marini, Ludovico
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On the positivity preserving property of hinged plates
SIAM Journal on Mathematical Analysis, 2009 In this work we show that the Kirchhoff–Love model for a hinged plate $\Delta^2 v = f \text{ in }E,\; v = \Delta v - (1 - \sigma) \kappa v_n = 0 \text{ on }\partial E$ admits, for $f \in L^2(E)$ and $-1 < \sigma < 1$, a unique weak solution in $W^{2,2}(E)
Stylianou, Athanasios, Parini, Enea
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Positivity preserving transformations for q-binomial coefficients [PDF]
Transactions of the American Mathematical Society, 2005 Several new transformations for q- binomial coefficients are found, which have the special feature that the kernel is a polynomial with nonnegative coefficients.
Warnaar, S. O., Berkovich, A.
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Preserving Positive Intermediate Curvature
The Journal of Geometric Analysis, 2023 AbstractConsider a compact manifoldN(with or without boundary) of dimensionn. Positivem-intermediate curvature interpolates between positive Ricci curvature ($$m = 1$$m=1) and positive scalar curvature ($$m = n-1$$m=n-1), and it is obstructed on partial tori$$N^n = M^{n-m} \times \mathbb {T}^m$$Nn=Mn-m×Tm. Given Riemannian metrics$$g, {\bar{g}}$$g,g¯on$
Tsz-Kiu Aaron Chow +2 more
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Experiments with a Positivity-Preserving Operator [PDF]
Experimental Mathematics, 2008 We consider some multivariate rational functions which have (or are conjectured to have) only positive coefficients in their series expansion. We consider an operator that preserves positivity of series coefficients, and apply the inverse of this operator to the rational functions.
Manuel Kauers, Doron Zeilberger
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Positivity preserving results for a biharmonic equation under Dirichlet boundary conditions [PDF]
Opuscula Mathematica, 2014 We prove a dichotomy result giving the positivity preserving property for a biharmonic equation with Dirichlet boundary conditions arising in MEMS models. We adapt some ideas in [H.-Ch. Grunau, G.
Hanen Ben Omrane, Saïma Khenissy
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Some standard and nonstandard finite difference schemes for a reaction–diffusion–chemotaxis model
Open Physics, 2023 Two standard and two nonstandard finite difference schemes are constructed to solve a basic reaction–diffusion–chemotaxis model, for which no exact solution is known.
de Waal Gysbert Nicolaas +2 more
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An Unconditional Positivity-Preserving Difference Scheme for Models of Cancer Migration and Invasion
Mathematics, 2022 In this paper, we consider models of cancer migration and invasion, which consist of two nonlinear parabolic equations (one of the convection–diffusion reaction type and the other of the diffusion–reaction type) and an additional nonlinear ordinary ...
Mikhail K. Kolev +2 more
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A positivity-preserving scheme for fluctuating hydrodynamics
Journal of Computational Physics, 2022 zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Francesco Magaletti +4 more
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