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This is a survey on the equivariant cohomology of Lie group actions on manifolds, from the point of view of de Rham theory. Emphasis is put on the notion of equivariant formality, as well as on applications to ordinary cohomology and to…

Differential Geometry · Mathematics 2019-03-29 Oliver Goertsches , Leopold Zoller

Many natural populations are well modelled through time-inhomogeneous stochastic processes. Such processes have been analysed in the physical sciences using a method based on Lie algebras, but this methodology is not widely used for models…

Probability · Mathematics 2011-11-24 Thomas House

This overview paper is intended as a quick introduction to Lie algebras of vector fields. Originally introduced in the late 19th century by Sophus Lie to capture symmetries of ordinary differential equations, these algebras, or…

Differential Geometry · Mathematics 2017-10-10 Jan Draisma

In this talk we introduce several topics in combinatorial number theory which are related to groups; the topics include combinatorial aspects of covers of groups by cosets, and also restricted sumsets and zero-sum problems on abelian…

Group Theory · Mathematics 2007-05-23 Zhi-Wei Sun

We prove some anologues for algebras of recent group-theoretic results (due to Khukhro, Klyachko, Makarenko, Milentyeva, and Shumyatsky) on large characteristic subgroups satisfying a given property.

Rings and Algebras · Mathematics 2018-04-03 Elizaveta Frolova

Group Theory has become an invaluable tool in the physics community. Despite numerous introductory books, the subject remains challenging for beginners. Mathematica has emerged as a popular tool for research and education, offering various…

Computational Group Theory is applied to indexed objects (tensors, spinors, and so on) with dummy indices. There are two groups to consider: one describes the intrinsic symmetries of the object and the other describes the interchange of…

Mathematical Physics · Physics 2009-11-07 L. R. U. Manssur , R. Portugal

A method is presented for finding the Lie point symmetry transformations acting simultaneously on difference equations and lattices, while leaving the solution set of the corresponding difference scheme invariant. The method is applied to…

Mathematical Physics · Physics 2013-07-10 Decio Levi , Sébastien Tremblay , Pavel Winternitz

In 2008, the author proposed a version of duality theory for (not necessarily, Abelian) complex Lie groups, based on the idea of using the Arens-Michael envelope of topological algebra and having an advantage over existing theories in that…

Functional Analysis · Mathematics 2022-10-18 S. S. Akbarov

This is the first in a series of papers investigating the relationship between the twisted equivariant K-theory of a compact Lie group G and the "Verlinde ring" of its loop group. In this paper we set up the foundations of twisted…

Algebraic Topology · Mathematics 2014-02-26 Daniel S. Freed , Michael J. Hopkins , Constantin Teleman

Kuz'min (1996) characterized groups having Wirtinger presentations in relation to their second group homology. In this paper, we further refine the relation between these groups and their second group homology.

Group Theory · Mathematics 2024-08-09 Toshiyuki Akita , Sota Takase

This survey is about the fundamentals of the theory of finite dimensional Lie groups over the field of real numbers. The notion of the tangent space of a manifold at a point is considered to be defined via the well known chart and vector…

History and Overview · Mathematics 2021-09-01 Farzad Shahi

The goal of this paper is to show that many key results found in the study of Einstein Lorentzian nilpotent Lie algebras can still hold in the more general settings of unimodular Lie algebras and (completely) solvable Lie algebras.

Differential Geometry · Mathematics 2022-10-31 Oumaima Tibssirte

This work concerns the definition and analysis of a new class of Lie systems on Poisson manifolds enjoying rich geometric features: the Lie--Hamilton systems. We devise methods to study their superposition rules, time independent constants…

Mathematical Physics · Physics 2017-09-01 J. F. Cariñena , J. de Lucas , C. Sardón

Necessary or sufficient conditions are presented for the existence of various types of actions of Lie groups and Lie algebras on manifolds.

Group Theory · Mathematics 2012-04-10 Morris W. Hirsch

The theory of superposition rules for solutions of a Lie system of first-order differential equations is extended to deal with analogous systems of second-order and the theory is illustrated with the very rich example of Ermakov-like…

Mathematical Physics · Physics 2008-10-21 José F. Cariñena , Javier de Lucas , Manuel F. Rañada

A cohomology theory for lambda-rings is developed. This is then applied to study deformations of lambda-rings.

Algebraic Topology · Mathematics 2007-05-23 Donald Yau

We prove a 2-categorical analogue of a classical result of Drinfeld: there is a one-to-one correspondence between connected, simply-connected Poisson Lie 2-groups and Lie 2-bialgebras. In fact, we also prove that there is a one-to-one…

Differential Geometry · Mathematics 2021-06-07 Zhuo Chen , Mathieu Stienon , Ping Xu

We consider a combinatorial problem occurring naturally in a group theoretical setting and provide a constructive solution in a special case. More precisely, in 1999 the author established a logarithmic bound for the derived length of the…

Combinatorics · Mathematics 2014-07-18 Thomas Michael Keller

In this lecture we review apprearance of the Riemann-Roch Theorem in classical function theory, Algebraic topology, in theory of pseudo-differential operators and finally in noncommutative geometry. We show also it usefulness in many…

Operator Algebras · Mathematics 2007-05-23 Do Ngoc Diep
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