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Жесткие геометрии на пространстве слоев слоений и группы их автоморфизмов
С. 48–51.
We introduce a category of rigid geometries on smooth singular spaces of leaves of foliations.
A special category $\mathfrak F_0$ containing orbifolds is allocated. Unlike orbifolds, objects
of $\mathfrak F_0$ can have non-Hausdorff topology and can even not satisfy the separability axiom $T_0$.
It is shown that the rigid geometry $(N,\zeta)$, where $N\in (\mathfrak F_0)$, allows a desingularization. For each such geometry $( N,\zeta)$ we prove the existence and uniqueness of the structure of a finite-dimensional Lie group in the group of all automorphisms $Aut (N},\zeta)$.
The applications to the orbifolds are considered.
Keywords: foliationслоениегруппа автоморфизмовorbifoldautomorphism groupleaf spaceleaf manifoldrigid geometryпространство слоевмногообразие слоевжесткая геометрия орбифолд
Publication based on the results of:
In book
Каз.: Издательство Казанского университета, 2017.
Gayfullin S., Kikteva V., Results in Mathematics 2026 Vol. 81 No. 5 Article 146
In this paper we obtain a criterion of flexibility for an affine complexity-zero horospherical variety. This result generalizes previously known results on flexibility of normal horospherical varieties, horospherical varieties with an action of a semisimple group, and non-normal toric varieties. ...
Added: August 3, 2026
Loginov K., Shramov K., / Series arXiv "math". 2025.
We study the action of the group of bimeromorphic automorphisms $\mathrm{Bim}(X)$ of a compact complex manifold $X$ on the image of the pluricanonical map, which we call the projective pluricanonical representation of this group. If $X$ is a Moishezon variety, then the image of $\mathrm{Bim}(X)$ via such a representation is a finite group by a ...
Added: September 27, 2025
Arzhantsev I., МЦНМО, 2025.
Учебное пособие посвящено действиям групп на множествах. Обсуждаются кратно транзитивные группы
перестановок, в том числе исключительные группы Матьё. Рассматривается свойство бесконечной транзитивности для групп автоморфизмов аффинных пространств и, в большей общности,
аффинных алгебраических многообразий.
Материал доступен студентам младших курсов. Изложение сопровождается большим количеством задач. ...
Added: July 21, 2025
Dedaev R., Zhukova N., Russian Journal of Nonlinear Dynamics 2025 Vol. 21 No. 1 P. 85–102
In this work, by a dynamical system we mean a pair (S, X), where S is either a pseudogroup
of local diffeomorphisms, or a transformation group, or a smooth foliation of the manifold X.
The groups of transformations can be both discrete and nondiscrete. We define the concepts of
attractor and global attractor of the dynamical system (S, ...
Added: March 5, 2025
Kikteva V., Sbornik Mathematics 2024 Vol. 215 No. 10 P. 1351–1373
We obtain a criterion for the automorphism group of an affine toric variety to be connected, stated in combinatorial terms and in terms of the divisor class group of the variety. We describe the component group of the automorphism group of a nondegenerate affine toric variety. In particular, we show that the number of connected components of ...
Added: January 27, 2025
Bagaev A., Zhukova N., Уфимский математический журнал 2025 Т. 17 № 4 С. 11–25
between orbifolds of same dimension. The definition of degree for the mentioned maps was introduced by Pasquoto and Rot (2020). We propose a new, simpler definition for the degree of proper maps between smooth oriented orbifolds of the same dimension and show that it is equivalent to the definition by Pasquotto and Rot. Using this ...
Added: January 24, 2025
Zhukova N., Sheina K., Известия высших учебных заведений. Прикладная нелинейная динамика 2024 Т. 32 № 6 С. 897–907
The purpose of the work is to study the groups of basic automorphisms of chaotic Cartan foliations with Ehresmann
connection. Cartan foliations form a category where automorphisms preserve not only the foliation, but also its transverse Cartan geometry. The group of basic automorphisms of a foliation is the quotient group of the group of all automorphisms ...
Added: November 11, 2024
Kikteva V., Математический сборник 2024 Т. 215 № 10 С. 89–113
We obtain a criterion for the automorphism group of an affine toric variety to be connected in combinatorial terms and in terms of the divisor class group of the variety. The component group of the automorphism group of a non-degenerate affine toric variety is described. In particular, we show that the number of connected components ...
Added: September 30, 2024
Borovik V., Gayfullin S., Shafarevich A., Mathematische Nachrichten 2024 Vol. 297 No. 9 P. 3174–3183
In this paper, we describe orbits of the automorphism group on an affine horospherical variety in terms of degrees of homogeneous with respect to natural grading locally nilpotent derivations. In case of (possibly nonnormal) toric varieties, a description of orbits of the automorphism group in terms of corresponding weight monoid is obtained. ...
Added: September 18, 2024
Trushin A., Математические заметки 2023 Т. 113 № 5 С. 780–784
It is known that the group of automorphisms of the algebra of polynomials in three variables is not generated by elementary automorphisms. In the article, a system of generators is constructed for the group of automorphisms preserving the nontrivial grading by integers. ...
Added: September 18, 2024
A. N. Trushin, Mathematical notes 2023 Vol. 113 No. 5 P. 736–740
It is known that the group of automorphisms of the algebra of polynomials in three variables is not generated by elementary automorphisms. In the article, a system of generators is constructed for the group of automorphisms preserving the nontrivial grading by integers. ...
Added: September 18, 2024
Perepechko A., Regeta A., Proceedings of the American Mathematical Society 2024 Vol. 152 No. 6 P. 2377–2383
Given an affine algebraic variety X, we prove that if the neutral component Aut◦(X) of the automorphism group consists of algebraic elements, then it is nested, i.e., is a direct limit of algebraic subgroups. This improves our earlier result (see Perepechko and Regeta [Transform. Groups 28 (2023), pp. 401–412]). To prove it, we obtain the ...
Added: May 1, 2024
Arzhantsev I., Perepechko A., Shakhmatov K., Bulletin des Sciences Mathematiques 2024 Vol. 192 Article 103419
We consider complete toric varieties X such that a maximal unipotent subgroup U of the automorphism group Aut(X) acts on X with an open orbit. It turns out that such varieties can be characterized by several remarkable properties. We study the set of Demazure roots of the corresponding complete fan, describe the structure of a ...
Added: April 12, 2024
Arzhantsev I., Zaitseva Y., Research in Mathematical Sciences 2024 Vol. 11 No. 2 Article 27
An algebraic variety X is called a homogeneous variety if the automorphism group Aut(X) acts on X transitively, and a homogeneous space if there exists a transitive action of an algebraic group on X. We prove a criterion of smoothness of a suspension to construct a wide class of homogeneous varieties. As an application, we ...
Added: March 23, 2024
Nina I. Zhukova, Journal of Geometry and Physics 2024 Vol. 199 Article 105166
We consider smooth codimension q foliations on n-dimensional manifolds where 0<q<n. We use Ehresmann connections as a technical tool to introduce the notion of sensitivity to initial conditions for foliations. We extend Devaney's definition of chaos for cascades to foliations with Ehresmann connection. Our main result states that sensitivity to initial conditions of a foliation ...
Added: March 10, 2024
Popov V., Transformation Groups 2023 Vol. 28 No. 3 P. 1277–1297
Considering a certain construction of algebraic varieties X endowed with an
algebraic action of the group Aut(F_n), n < \infty, we obtain a criterion for the faithfulness
of this action. It gives an in nite family F of Xs such that Aut(F_n) embeds into Aut(X).
For n > 2, this implies nonlinearity, and for n > 1, the ...
Added: January 7, 2024