Results 61 to 70 of about 18,324 (228)

Automorphism invariant measures and weakly generic automorphisms

Mathematical Logic Quarterly, 2022
AbstractLet be a countable ℵ0‐homogeneous structure. The primary motivation of this work is to study different amenability properties of (subgroups of) the automorphism group of ; the secondary motivation is to study the existence of weakly generic automorphisms of .
openaire   +1 more source

An obstruction to the strong relative hyperbolicity of a group

, 2006
We give a simple combinatorial criterion for a group that, when satisfied, implies the group cannot be strongly relatively hyperbolic. Our criterion applies to several classes of groups, such as surface mapping class groups, Torelli groups, and ...
Javier Aramayona, Aramayona, Javier, James W. Anderson, Anderson, James W., Kenneth J. Shackleton, Shackleton, Kenneth J.   +5 more
core   +1 more source

Algebraic reflexivity of isometry groups and automorphism groups of some operator structures [PDF]

, 2013
We establish the algebraic re exivity of three isometry groups of operator structures: The group of all surjective isometries on the unitary group, the group of all surjective isometries on the set of all positive invertible operators equipped with ...
Botelho, Fernanda, Jamison, James, Molnár, Lajos   +2 more
core   +2 more sources

A Berezin-type map and a class of weighted composition operators

Concrete Operators, 2017
In this paper we consider the map L defined on the Bergman space La2(𝔺+)$L_a^2({{\rm\mathbb{C}}_{\rm{ + }}})$ of the right half plane ℂ+ by (Lf)(w)=πM′(w)∫𝔺+(fM′)(s)|bw(s)|2dA˜(s)$(Lf)(w) = \pi M'(w)\int\limits_{{{\rm\mathbb{C}}_{\rm{ + }}}} {\left( {{f \
Das Namita
doaj   +1 more source

Rational points on even‐dimensional Fermat cubics

Transactions of the London Mathematical Society, Volume 13, Issue 1, December 2026.
Abstract We show that even‐dimensional Fermat cubic hypersurfaces are rational over any field of characteristic not equal to three, by constructing explicit rational parameterizations with polynomials of low degree. As a byproduct of our rationality constructions, we obtain estimates for the number of their rational points over a number field and ...
Alex Massarenti
wiley   +1 more source

Automorphisms of Unitals

Bulletin of the Belgian Mathematical Society - Simon Stevin, 2006
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Stroppel, Markus, van Maldeghem, Hendrik
openaire   +3 more sources

Characterizing Inner Automorphisms and Realizing Outer Automorphisms [PDF]

Advances in Group Theory and Applications
We give elementary proofs of the following two theorems on automorphisms of a finite group G: (1) An automorphism of G is inner if and only if it extends to an automorphism of every finite group containing G.
Benjamin Sambale
doaj   +1 more source

Nonlinear automorphism of the conformal algebra in 2D and continuous T T ¯ $$ \sqrt{T\overline{T}} $$ deformations

Journal of High Energy Physics, 2022
The conformal algebra in 2D (Diff(S 1)⨁Diff(S 1)) is shown to be preserved under a nonlinear map that mixes both chiral (holomorphic) generators T and T ¯ $$ \overline{T} $$ .
David Tempo, Ricardo Troncoso
doaj   +1 more source

On the automorphisms of the power semigroups of a numerical semigroup

Transactions of the London Mathematical Society, Volume 13, Issue 1, December 2026.
Abstract If H$H$ is a numerical semigroup (i.e., a cofinite subset of the non‐negative integers closed under addition), then the collection of all non‐empty subsets of H$H$ forms a semigroup P(H)$\mathcal {P}(H)$ under the sumset operation induced by addition in H$H$.
Salvatore Tringali, Kerou Wen
wiley   +1 more source

On Automorphisms of Subfactors

Journal of Functional Analysis, 1996
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
openaire   +4 more sources