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Showing 1 to 20 of 83 for “"Semigroups"”.
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Affine semigroups and c-semigroups
… articles and has as its object of study affine semigroups and C-semigroups, from both a theoretical and computational perspective. Considering numerical semigroups as a starting point, the aim of this thesis is to generalize certain properties, characterizations, invariants, and known …
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Generalized Numerical Semigroups
… as a straightforward generalization of numerical semigroups, are considered for the first time in a recent work of G. Failla, C. Peterson and R.Utano. Such monoids are called there \emph{generalized numerical semigroups}, and that work may represent the beginning of a systematic study on such …
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Quasi-Pure E0-Semigroups
We introduce the class of quasi-pure E0-semigroups acting on a von Neumann algebra as that with equal tail and fixed-point algebras and we describe these notable algebras for E0-semigroups of B(H) where H is a separable Hilbert space. We consider the classes of pure, quasi-pure and ergodic …
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Conjugation in abstract semigroups
… coincides with the usual conjugation, but in semigroups, it is not transitive in general. Finding classes of semigroups in which primary conjugacy is transitive is an interesting open problem. Kudryavtseva proved that transitivity holds for completely regular semigroups, and more recently …
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Subsemigroup structure of finite transformation semigroups.
… 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 subsemigroups are defined according to their idempotent structure and isomorphisms are …
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Operator Semigroups: Definitions, Properties and Applications
… we study the theory of one-parameter semigroups. The theory is developed from the simplest scalar case and finite dimensional case to semigroups of linear operators on Banach spaces which started in the first half of the last century. This thesis is designed to give a basic …
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Restriction Semigroups: Structure, Varieties and Presentations
Classes of (left) restriction semigroups arise from partial transformation monoids and form a wider class than inverse semigroups. Firstly, we produce a presentation of the Szendrei expansion of a monoid, which is a left restriction monoid, using a similar approach to Exel's presentation for the …
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Banach algebras on groups and semigroups
This thesis concerns the theory of Banach algebras, particularly those coming from abstract harmonic analysis. The focus for much of the thesis is the theory of the ideals of these algebras. In the final chapter we use semigroup algebras to solve an open probelm in the theory of C*-algebras. …
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Harmonic Analysis on Algebraically Irreducible Semigroups
Made available in DSpace on 2014-12-09T22:17:45Z (GMT). No. of bitstreams: 1 6901297.pdf: 1562000 bytes, checksum: 752b9438425719a19712555dd78ce577 (MD5) Previous issue date: 1967
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On Invariant Means Over Topological Semigroups
Made available in DSpace on 2014-12-05T21:50:02Z (GMT). No. of bitstreams: 1 0010538.pdf: 1693292 bytes, checksum: 301fc76d6b38e1b1770d8b806bbd40f0 (MD5) Previous issue date: 1954
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Right Generalized w-L- Unipotent Bisimple Semigroups.
Let S be a regular bisimple semigroup such that the union T of the maximal subgroups of S is an w-chain of rectangular groups.[Equations Omitted].
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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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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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On the Combinatorics of Certain Garside Semigroups
In his dissertation, F.A. Garside provided a solution to the word and conjugacy problems in the braid group on n-strands, using a particular element that he called the fundamental word. Others have since defined fundamental words in the generalized setting of Artin groups, and even more recently in …
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Completely Invariant Julia Sets of Rational Semigroups
… particular importance to the study of rational semigroups.
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Recursive Function Theory in Groups and Semigroups
Made available in DSpace on 2014-12-14T13:09:44Z (GMT). No. of bitstreams: 1 8009113.pdf: 4391205 bytes, checksum: f69883a5f5369d54a26f31163d28de47 (MD5) Previous issue date: 1979
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Fault-tolerant computation in semigroups and semirings
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
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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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