Results 281 to 290 of about 18,081 (306)
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Nica’s q-Convolution is Not Positivity Preserving
Communications in Mathematical Physics, 2005zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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Positivity-Preserving Scattered Data Interpolation
2005The construction of a C1 interpolant to scattered data is considered in which the interpolant is positive everywhere if the original data are positive. This study is motivated by earlier work in which sufficient conditions are derived on Bezier points in order to ensure that surfaces comprising cubic Bezier triangular patches are always positive.
Abd. Rahni Mt. Piah +2 more
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Preservations of Positive Realness under Discretizations
1993 American Control Conference, 1993Positive Realness preservation properties of five commonly used discretization methods have been examined in this paper.
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Families of positivity preserving but not completely positive superoperators
Physics Letters A, 2005zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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The tail of a positivity-preserving semigroup
Israel Journal of Mathematics, 1974With certain assumptions a representation theorem is proved for the elements of $$ \cap _{\sigma \in \Sigma } $$ σS, where Σ is an abelian semigroup of, endomorphisms of a real vector space, andS is a convex antisymmetric cone.
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Preservation Librarian: Position Overview
201950 years after Frazer Poole was named the first Preservation Librarian at the Library of Congress, Preservation Librarianship is a small but mature field in research libraries. Since Poole began his work, the core responsibilities of the position, namely to ensure enduring access to collections acquired and held by libraries, remain essentially ...
Durant, Fletcher, Smith, Bonnie
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Positivity Preserving Model Reduction
2009We propose a model reduction method for positive systems that ensures the positivity of the reduced model. Our approach is based on constructing diagonal solutions of Lyapunov inequalities. These are linear matrix inequalities (LMIs), which are shown to be feasible.
Timo Reis, Elena Virnik
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Preserving Positive Isotropic Curvature
2010The condition of positive curvature on totally isotropic 2-planes was first introduced by Micallef and Moore [MM88].
Ben Andrews, Christopher Hopper
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Modified mass matrices and positivity preservation for hyperbolic and parabolic PDEs
Communications in Numerical Methods in Engineering, 2001M Berzins
exaly