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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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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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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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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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