Results 11 to 20 of about 53,784 (240)
Cosmic Crystallography with a Pullback [PDF]
Physics Letters A, 1999 We present a modified version of the cosmic crystallography method, especially useful for testing closed models of negative spatial curvature. The images of clusters of galaxies in simulated catalogs are ``pulled back'' to the fundamental domain before ...
Best +7 more
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Star operations and pullbacks [PDF]
Journal of Algebra, 2003 to appear in J ...
Marco Fontana, Mi Hee Park
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Pullbacks of Banach Bundles [PDF]
Rocky Mountain Journal of Mathematics, 1992 Joseph W. Kitchen, Dennis A. Robbins
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The American Journal of CombinatoricsWe introduce a generalization of parking functions in which cars are limited in their movement backwards and forwards by two nonnegative integer parameters \(k\) and \(\ell\), respectively.
Jennifer Elder +5 more
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The Pullbacks of Principal Coactions
Documenta Mathematica, 2010 We prove that the class of principal coactions is closed under one-surjective pullbacks in an appropriate category of algebras equipped with left and right coactions. This allows us to handle cases of C^* -algebras lacking two different non-trivial ideals.
Piotr M. Hajac, Elmar Wagner
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On the class group of a pullback
Journal of Pure and Applied Algebra, 2002 Abstract Let T be an integral domain, I a nonzero proper ideal of T , and ϕ : T→T/I the natural projection. For an integral domain D which is a proper subring of T / I , R = ϕ −1 ( D ) is then a subring of T . We investigate the class group Cl ( R ), the Picard group Pic ( R ), and the local class group G ( R ) of the ...
Saı̈d El Baghdadi
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Pullbacks and universal catenarity [PDF]
Publicacions Matemàtiques, 2008 This paper deals with the universal catenarity of a pullback construction ring. It seeks necessary and sufficient conditions for such a pullback to have the universal catenarity, improving some known results. Its main result leads to new examples of universally catenarian domains.
Jarboui, Noômen, Jerbi, Ayada
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Existence of pullback attractors for pullback asymptotically compact processes [PDF]
Nonlinear Analysis: Theory, Methods & Applications, 2010 This paper is concerned with the existence of pullback attractors for evolution processes. Our aim is to provide results that extend the following results for autonomous evolution processes (semigroups) i) An autonomous evolution process which is bounded dissipative and asymptotically compact has a global attractor.
Caraballo Garrido, Tomás +3 more
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Perinormality in pullbacks [PDF]
Journal of Commutative Algebra, 2019 We further develop the notion of perinormality from our last paper, showing that it is preserved by many pullback constructions. In doing so, we introduce the concepts of relative perinormality and fragility for ring extensions.
Epstein, Neil, Shapiro, Jay
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On the $K$-theory of pullbacks [PDF]
Annals of Mathematics, 2019 To any pullback square of ring spectra we associate a new ring spectrum and use it to describe the failure of excision in algebraic $K$-theory. The construction of this new ring spectrum is categorical and hence allows to determine the failure of excision for any localizing invariant in place of $K$-theory.
Markus Land, Georg Tamme
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