Results 21 to 30 of about 143,594 (316)
Prime Fano threefolds of genus 12 with a $G_m$-action [PDF]
Épijournal de Géométrie Algébrique, 2018 We give an explicit construction of prime Fano threefolds of genus 12 with a $G_m$-action, describe their isomorphism classes and automorphism groups.
Alexander Kuznetsov, Yuri Prokhorov
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The classification of three-dimensional Lie algebras on complex field
Дифференциальная геометрия многообразий фигур, 2021 In this paper, we study the classification of three-dimensional Lie algebras over a field of complex numbers up to isomorphism. The proposed classification is based on the consideration of objects invariant with respect to isomorphism, namely such ...
E.R. Shamardina
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The Structure of Local Rings with Singleton Basis and Their Enumeration
Mathematics, 2022 A local ring is an associative ring with unique maximal ideal. We associate with each Artinian local ring with singleton basis four invariants (positive integers) p,n,s,t.
Yousef Alkhamees, Sami Alabiad
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The Isomorphism Problem on Classes of Automatic Structures [PDF]
2010 25th Annual IEEE Symposium on Logic in Computer Science, 2010 Automatic structures are finitely presented structures where the universe and all relations can be recognized by finite automata. It is known that the isomorphism problem for automatic structures is complete for $Σ^1_1$; the first existential level of the analytical hierarchy.
Dietrich Kuske +2 more
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Generation of colored graphs with isomorphism rejection [PDF]
Известия Саратовского университета. Новая серия: Математика. Механика. Информатика, 2021 In the article we consider graphs whose vertices or edges are colored in a given number of colors — vertex and edge colorings. The study of colorings of graphs began in the middle of the 19th century, but the main attention is paid to proper ...
Razumovsky, Peter Vladimirovich +1 more
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Towards an Isomorphism Dichotomy for Hereditary Graph Classes [PDF]
, 2014 In this paper we resolve the complexity of the isomorphism problem on all but finitely many of the graph classes characterized by two forbidden induced subgraphs.
Schweitzer, Pascal
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Isomorphism classes of idempotent evolution algebras
Linear Algebra and its Applications, 2023 We showed that isomorphism classes of idempotent evolution algebras are in bijection with the orbits of the semidirect product group of the symmetric group and the torus, considered the combinatoric problem of enumeration of isomorphism classes for these algebras over arbitrary finite fields, derived a general counting formula, and obtained explicit ...
Yangjiang Wei, Yi Ming Zou
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Formulas and Properties, Their Links and Characteristics
Mathematics, 2021 In this work, we study links between first-order formulas and arbitrary properties for families of theories, classes of structures and their isomorphism types.
Sergey V. Sudoplatov
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Isomorphism Classes of A-Hypergeometric Systems [PDF]
Compositio Mathematica, 2001 Given a finite set A of integral vectors and a parameter vector, Gel'fand, Kapranov, and Zelevinskii defined a system of differential equations, called an A - hypergeometric (or a GKZ ...
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Automorphism Properties and Classification of Adinkras
Advances in Mathematical Physics, 2015 Adinkras are graphical tools for studying off-shell representations of supersymmetry. In this paper we efficiently classify the automorphism groups of Adinkras relative to a set of local parameters.
B. L. Douglas +3 more
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