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Showing 1 to 20 of 80 for “"semigroup"”.
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On Semigroup Rings
Some of the properties of semigroup rings are described, illustrated and proved in this study. In particular, the central problem focuses on how various properties of the semigroup and ring are reflected in the resulting semigroup ring.
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Finite bases for semigroup varieties
O objetivo deste trabalho é fornecer um atlas das bases de identidades para as variedades geradas por semigrupos e grupos de ordem pequena. Com o propósito de auxiliar os matemáticos que trabalham neste campo a encontrar informações com facilidade, foi implementado um website que executa em segundo …
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C0-Semigroup Methods for Delay Equations
In der Dissertation werden Werkzeuge zur Analyse von Wohlgestelltheit und Asymptotik von Integro-Differential- und Verzögerungsgleichungen entwickelt. Im ersten Teil der Arbeit (Kapitel 1 und 2) werden Methoden zur Bestimmung der Modulhalbgruppe (kleinste dominierende C0-Halbgruppe) einer …
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The Left Regular Representation of a Semigroup
… can study the left regular representation of a semigroup. If one considers such representations, then it is natural to ask similar questions to the group case. We start by formulating several questions in the semigroup case and then work towards understanding the structure of the representations …
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Presentations of Semigroup Algebras of Weighted Trees
We study presentations for subalgebras of invariants of the coordinate algebras of binary symmetric models of phylogenetic trees studied by Buczynska and Wisniewski. These algebras arise as toric degenerations of projective coordinate rings of weight varieties of the Grassmannian of two planes …
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A semigroup/Laplace transform approach to approximating flows
… known that all flows in a state space O induce a semigroup of linear operators on an appropriately chosen vector space of functions (observables) from O into a vector space Z (observations). After choosing appropriate continuity assumptions on the flow, the associated semigroup will be strongly …
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Uniqueness of the Invariant Mean on an Abelian Semigroup
Made available in DSpace on 2014-12-05T21:50:08Z (GMT). No. of bitstreams: 1 0023352.pdf: 1762719 bytes, checksum: 2d20176fb8029d74df5412a24fb95d8d (MD5) Previous issue date: 1957
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Unitary equivalence of spectral measures on a Baer -semigroup
… equivalence of spectral measures on a Baer *-semigroup. A connection is made between abstract spectral measures, and three other distinct mathematical systems. Chapter II is devoted specifically to generalizing the concept of a spectral measure and to determining necessary and sufficient …
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Extreme Invariant Means and Minimal Sets in the Stone-Cech Compactification of a Semigroup
Made available in DSpace on 2014-12-11T18:23:32Z (GMT). No. of bitstreams: 1 7105092.pdf: 1499862 bytes, checksum: 6ff29ca9e7e86a9a9e5f448e11024d4a (MD5) Previous issue date: 1970
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Composition Sequences and Semigroups of Möbius Transformations
… by the theory of continued fractions, we study semigroups of Möbius transformations. Like Kleinian groups, semigroups have limit sets, and indeed each semigroup is equipped with two limit sets. We find that limit sets have an internal structure with features similar to the limit sets of Kleinian …
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The Equivalence "t" on ω-Orthodox Semigroups.
If X is a subset of a semigroup, E(X) will denote the set of idempotents of X. A regular semigroup S will be termed an w-orthodox semigroup if E(S) is an ω-chain of rectangular bands (Ennen, the non-negative integers).
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Semigruppi buoni
A good semigroup of N^d is a submonoid of N^d which is closed under infimimus, have conductor, and satisfies a specific compatibility property on its elements. The definition of good semigroup arise from the properties of the value semigroups of a one dimensional analytically unramified ring; in …
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Strictly Orthodox Bisimple Semigroups of Type-ω, I.
… the structure of strictly orthodox bisimple semigroups of type-ω.Since E(S) E(T), E(S) is a sub semigroup of S. Hence S is an orthodox semigroup in the sense of Hall (3). Now, if Green's relations Rand L are congruence relations on both T and E(S) then we call S a strictly orthodox bisimple …
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Exponential Stability for a Diffusion Equation in Polymer Kinetic Theory
… models for polymer flow. Using the methods of semigroup theory, we show that the semigroup U(t) associated with the diffusion equation is well defined and that all solutions converge exponentially to an equilibrium solution. Both finitely and infinitely extensible dumbbell models are …
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Practicality of methods of stability analysis for nonlinear reactor systems
… by Lyapunov's direct method and a modified semigroup method were compared with a direct numerical solution of a space-time nonlinear reactor system. The example employed the xenon-induced flux oscillation problem. It was found that the Lyapunov method and modified semigroup method were very …
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Semigroups of Composition Operators and the Cesaro Operator on H('p)(d) (Bergman Space, Infinitesimal Generator)
A semigroup T(,t) : t (GREATERTHEQ) 0 of composition operators on H('P)( ) arises as T(,t)(f) = f(CCIRC)(phi)(,t) where (phi)(,t) : t (GREATERTHEQ) 0 is a semigroup of analytic functions mapping the unit disk into itself. The infinitesimal
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Non-selfadjoint operator algebras generated by unitary semigroups
… generated by the translation and multiplication semigroups. In particular, they proved that this algebra is reflexive, in the sense of Halmos, and is equal to the Fourier binest algebra, that is, to the algebra of operators that leave invariant the subspaces in the Volterra nest and its analytic …
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Subsemigroup structure of finite transformation semigroups.
… order that a subset of a finite transformation semigroup be a subsemigroup are developed in this paper. The existence of several subsemigroups of various orders is established. Also, some results concerning idem- potents and generators of idempotents are proved. Then certain classes of …
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Topological Dynamics On Compact Phase Spaces
… X$ is a separately continuous action of a semigroup $S$ on $X$. Historically, as was introduced by R.Ellis 1960, the enveloping semigroup, which is a closure of the set of continuous functions on a compact space $X$, was discovered to be an important tool to study dynamical systems. Soon, a …
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