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E ∗-dense E-semigroups
Springer Science and Business Media LLC - Tập 89 - Trang 105-124 - 2014
John Fountain, Anthony Hayes
We obtain a covering theorem for E ∗-dense E-semigroups showing that such a semigroup has an E ∗-dense, strongly E ∗-unitary E-semigroup as a cover and describe the structure of the latter semigroups.
On semigroup presentations that define a group
Springer Science and Business Media LLC - Tập 90 - Trang 149-154 - 2014
G. Ayık, B. Özer
We consider the finite semigroup presentations of the form $$\begin{aligned} \mathcal {P}=\langle a_1,\cdots ,a_n\mid w_1=a_1,\cdots ,w_n=a_n \rangle \end{aligned}$$ and their Adian graphs. It is known that if both Adian graphs of ...... hiện toàn bộ
On a Perturbation Theorem of Kaiser and Weis
Springer Science and Business Media LLC - Tập 70 - Trang 471-474 - 2005
Charles J. K. Batty
We improve a perturbation theorem of C. Kaiser and L. Weis for semigroups of operators on Hilbert spaces by using a generation theorem of A.M. Gomilko, D.H. Shi and D.X. Feng.
Corrigendum on “semigroup-theoretic proofs of the central limit theorem and other theorems of analysis”
Springer Science and Business Media LLC - Tập 12 - Trang 388-388 - 1976
Jerome A. Goldstein
Problems about semitopological semigroups
Springer Science and Business Media LLC - Tập 19 - Trang 373-383 - 1980
John F. Berglund
Weakly almost periodic representations of semigroups by Markov operators
Springer Science and Business Media LLC - Tập 35 - Trang 195-205 - 1986
H. D. Junghenn
Group closures of partial transformations
Springer Science and Business Media LLC - Tập 65 - Trang 301-313 - 2001
Inessa Levi, Japheth Wood
Let \(X\) be an infinite set, \(f\) a partial one-to-one transformation of \(X\), and \(H\) a normal subgroup of G X , the group of all permutations of \(X\). We investigate when \(H\) is equal to \(G_{}\). That is, we are interested when \(H\) is the full group of normalizers of the semigroup of transformations on \(X\) generated by conjugates of \(f\) by e...... hiện toàn bộ
The equivalence of uniquely divisible semigroups and uniquely representable semigroups on the two-cell
Springer Science and Business Media LLC - Tập 4 - Trang 69-72 - 1972
E. E. DeVun
This talk brings together the results of several papers in order to show that the uniquely divisible semigroups on the two-cell are exactly the uniquely representable semigroups on the two-cell.
On exposed semigroup homomophins
Springer Science and Business Media LLC - Tập 13 - Trang 189-204 - 1976
Benno Fuchssteiner
In the main theorem of this paper the existence of weakly exposed semigroup homomorphisms is proved. This theorem is effectively equivalent to the axiom of choice and generalizes some well known theorems of functional analysis like the Hahn-Banach theorem, the Krein-Milman theorem, Bauer's minimum principle and a result of T. Husain and I. Tweddle.
A Semilinear Structure on Semigroups in a Metric Space
Springer Science and Business Media LLC - Tập 68 - Trang 419-444 - 2004
Rinaldo M. Colombo, Andrea Corli
We introduce a sort of semilinear structure on subsets of the family of semigroups defined on a metric space. The key step is the definition of the sum of two semigroups, which is here achieved by means of the classical operator splitting technique. No linearity assumption is required, since the whole construction is in a metric space.
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