Results 31 to 40 of about 163,882 (275)
Braiding groups of automorphisms and almost-automorphisms of trees
Canadian Journal of Mathematics, 2023 AbstractWe introduce “braided” versions of self-similar groups and Röver–Nekrashevych groups, and study their finiteness properties. This generalizes work of Aroca and Cumplido, and the first author and Wu, who considered the case when the self-similar groups are what we call “self-identical.” In particular, we use a braided version of the Grigorchuk ...
Rachel Skipper, Matthew C. B. Zaremsky
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Topological classification of conformal actions on p-hyperelliptic and (q,n)-gonal Riemann surfaces [PDF]
Opuscula Mathematica, 2009 A compact Riemann surface \(X\) of genus \(g \gt 1\) is said to be \(p\)-hyperelliptic if \(X\) admits a conformal involution \(\rho\) for which \(X / \rho\) has genus \(p\). A conformal automorphism \(\delta\) of prime order \(n\) such that \(X / \delta\
Ewa Tyszkowska
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Automorphism Groups of Compact Complex Surfaces [PDF]
International mathematics research notices, 2017 We study automorphism groups and birational automorphism groups of compact complex surfaces. We show that the automorphism group of such a surface $X$ is always Jordan, and the birational automorphism group is Jordan unless $X$ is birational to a ...
Yuri Prokhorov, C. Shramov
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Hilbert schemes of lines and conics and automorphism groups of Fano threefolds [PDF]
, 2016 We discuss various results on Hilbert schemes of lines and conics and automorphism groups of smooth Fano threefolds of Picard rank 1. Besides a general review of facts well known to experts, the paper contains some new results, for instance, we give a ...
A. Kuznetsov, Yuri Prokhorov, C. Shramov
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Automorphisms of decompositions [PDF]
Mathematica Slovaca, 2016 Abstract In [HARDING, J.: Decompositions in quantum logic, Trans. Amer. Math. Soc. 348 (1996), 1839–1862] the author showed that the direct product decompositions of many different types of structures, such as sets, groups, vector spaces, topological spaces, and relational structures, naturally form orthomodular posets.
John Harding, Tim Hannan
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Automorphism groups of quandles and related groups [PDF]
Monatshefte für Mathematik (Print), 2017 In this paper we study various questions concerning automorphisms of quandles. For a conjugation quandle $$Q=\mathrm{Conj}(G)$$Q=Conj(G) of a group G we determine several subgroups of $$\mathrm{Aut}(Q)$$Aut(Q) and find necessary and sufficient conditions
V. Bardakov +2 more
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Cluster automorphisms and quasi-automorphisms
Advances in Applied Mathematics, 2019 We study the relation between the cluster automorphisms and the quasi-automorphisms of a cluster algebra $\mathcal{A}$. We proof that under some mild condition, satisfied for example by every skew-symmetric cluster algebra, the quasi-automorphism group of $\mathcal{A}$ is isomorphic to a subgroup of the cluster automorphism group of $\mathcal{A}_{triv}$
Ralf Schiffler, Wen Chang, Wen Chang
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Enriques surfaces with finite automorphism group in positive characteristic [PDF]
Algebraic Geometry, 2017 We classify Enriques surfaces with smooth K3 cover and finite automorphism group in arbitrary positive characteristic. The classification is the same as over the complex numbers except that some types are missing in small characteristics.
G. Martin
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Automorphisms of Submanifolds [PDF]
Advances in Difference Equations, 2010 The paper deals with local symmetries of the infinite-order jet space of C∞-smooth n-dimensional submanifolds in ℝm+n. Transformations under consideration are the most general possible. They need not preserve the distinction between dependent, and independent variables, the order of derivatives and the hierarchy of finite-order jet spaces.
Václav Tryhuk, Veronika Chrastinová
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Skew Calabi-Yau Algebras and Homological Identities [PDF]
, 2013 A skew Calabi-Yau algebra is a generalization of a Calabi-Yau algebra which allows for a non-trivial Nakayama automorphism. We prove three homological identities about the Nakayama automorphism and give several applications. The identities we prove show (
Reyes, Manuel +2 more
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