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E ∗-dense E-semigroups
Springer Science and Business Media LLC - Tập 89 - Trang 105-124 - 2014
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
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
$$\mathcal {P}$$ are connected and if one of the Adian graphs of $$\mathcal
{P}$$ is a cycle graph then $$\mathcal {P}$$ defines a group (see 2008). We
extend this resul...
On a Perturbation Theorem of Kaiser and Weis
Springer Science and Business Media LLC - Tập 70 - Trang 471-474 - 2005
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
Problems about semitopological semigroups
Springer Science and Business Media LLC - Tập 19 - Trang 373-383 - 1980
First announcement Conference on Semigroups and Applications University of St Andrews, Scotland July 2–9, 1997
Springer Science and Business Media LLC - Tập 53 - Trang 399-399 - 1996
Weakly almost periodic representations of semigroups by Markov operators
Springer Science and Business Media LLC - Tập 35 - Trang 195-205 - 1986
Group closures of partial transformations
Springer Science and Business Media LLC - Tập 65 - Trang 301-313 - 2001
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 elements of \(H\)....
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
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
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.
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