Results 31 to 40 of about 377,631 (158)
A Positivity-Preserving Relaxation Algorithm
CoRRWe combine Patankar-type methods with suitable relaxation procedures that are capable of ensuring correct dissipation or conservation of functionals such as entropy or energy while producing unconditionally positive and conservative approximations. To that end, we adapt the relaxation algorithm to enforce positivity by using either ideas from the dense
Thomas Izgin +2 more
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Arbitrary order positivity preserving finite-volume schemes for 2D elliptic problems
, 2023 International audienceThe positivity preservation is very important in most applications solving elliptic problems. Many schemes preserving positivity has been proposed but are at most second-order convergent.
Blanc, Xavier +3 more
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Preserving positivity for matrices with sparsity constraints
, 2016 Functions preserving Loewner positivity when applied entrywise to positive semidefinite matrices have been widely studied in the literature. Following the work of Schoenberg [Duke Math. J. 9], Rudin [Duke Math. J.
Khare, Apoorva +2 more
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Ergodic semigroups of positivity preserving self-adjoint operators
, 1973 We prove that an ergodic semigroup of positivity preserving self-adjoint operators is positivity improving. We also present a new proof (using Markov techniques) of the ergodicity of semigroups generated by spatially cutoff P(ϑ)2 ...
Simon, Barry
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Courant’s nodal domain theorem for positivity preserving forms
, 2020 We introduce a notion of nodal domains for positivity preserving forms. This notion generalizes the classical ones for Laplacians on domains and on graphs.
Keller, Matthias (Prof. Dr.) +1 more
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Asymptotic periodicity of the iterates of positivity preserving operators [PDF]
Transactions of the American Mathematical Society, 1988 Assume that (A1) X X is a real Banach space. (A2)
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, 2013 This paper proposes the sufficient conditions for positivity preserving cubic boundary curves defined on rectangular grid using polynomial solution of fourth order linear PDEs in order to improve the positivity preserving of the interpolating surface. We
Ahmed Kherd +5 more
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Positivity of Continuous-Time Descriptor Systems With Time Delays [PDF]
, 2014 This technical note is concerned with positivity characteristic of continuous-time descriptor systems with time delays. First, a set of necessary and sufficient conditions is presented to check the property.
Yan, Xinggang +3 more
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An energy stable and positivity-preserving scheme for the Maxwell-Stefan diffusion system
, 2021 We develop a new finite difference scheme for the Maxwell-Stefan diffusion system. The scheme is conservative, energy stable and positivity-preserving.
Tzavaras, Athanasios +3 more
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Markov Processes Associated With Positivity Preserving Coercive Forms
, 1995 Ma Z-M, Röckner M. Markov Processes Associated With Positivity Preserving Coercive Forms. Canadian Journal of Mathematics = Journal Canadien de Mathématiques .
Zhi-Ming Ma +3 more
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