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For a finite abelian group $G$, we compute the $G$-equivariant formal group law corresponding to the $G$-equivariant complex cobordism spectrum with its canonical complex orientation.

Algebraic Topology · Mathematics 2015-03-31 William C. Abram

In this paper we compute homotopical bordism rings $MU^G_*$ for abelian compact Lie groups G, giving explicit generators and relations. The key constructions are operations on equivariant bordism which should play an important role in…

Algebraic Topology · Mathematics 2007-05-23 Dev Sinha

We compute the cobordism ring $MU^*(BG)\otimes \mathbb{F}_p$ when $G$ is a Chevalley group. In the particular case of the general linear group, we prove that it agrees with the Chow ring (as defined by Totaro).

Algebraic Topology · Mathematics 2012-09-21 Pierre Guillot

We define algebraic cobordism of classifying spaces, \Omega^*(BG) and G-equivariant algebraic cobordism \Omega^*_G(-) for a linear algebraic group G. We prove some properties of the coniveau filtration on algebraic cobordism, denoted…

Algebraic Geometry · Mathematics 2009-07-28 Dinesh Deshpande

In this paper, we calculate the coefficient ring of equivariant Thom complex cobordism for the symmetric group on three elements. We also make some remarks on general methods of calculating certain pullbacks of rings which typically occur…

Algebraic Topology · Mathematics 2021-09-03 Po Hu , Igor Kriz , Yunze Lu

We survey some results in the field of equivariant cobordism. In particular, we use methods from equivariant stable homotopy theory to calculate the unoriented $C_2$-equivariant bordism ring $\Omega^{C_2}_*$, which was originally calculated…

Algebraic Topology · Mathematics 2024-02-21 Jack Carlisle

We describe the equivariant cobordism ring of smooth toric varieties. This equivariant description is used to compute the ordinary cobordism ring of such varieties.

Algebraic Geometry · Mathematics 2010-11-03 Amalendu Krishna , V. Uma

In this paper, we build on the work from our previous paper (arXiv:2002.01556) to show that periodic rational $G$-equivariant topological $K$-theory has a unique genuine-commutative ring structure for $G$ a finite abelian group. This means…

Algebraic Topology · Mathematics 2021-04-05 Anna Marie Bohmann , Christy Hazel , Jocelyne Ishak , Magdalena Kędziorek , Clover May

Previously the second author has constructed by cobordism methods, an invariant associated to a finite group $G$. This invariant approximates the number of subgroups of a group, giving in some cases the number of abelian and cyclic…

Geometric Topology · Mathematics 2018-05-15 Bruno Cisneros , Carlos Segovia

In this paper we compute homotopical equivariant bordism for the group ${\bf Z/2}$, namely $MO^{\bf Z/2}$, geometric equivariant bordism $\Omega^{\bf Z/2}_*$, and their quotient as modules over geometric bordism. This quotient is a module…

Algebraic Topology · Mathematics 2007-05-23 Dev Sinha

This paper presents a commutative complex oriented cohomology theory with coefficients the quotient ring of complex cobordism MU$^*[1/2]$ modulo the ideal generated by any subsequence of any polynomial generators in special unitary…

Algebraic Topology · Mathematics 2022-12-29 Malkhaz Bakuradze

We establish a Schubert calculus for Bott-Samelson resolutions in the algebraic cobordism ring of a complete flag variety G/B.

Algebraic Geometry · Mathematics 2014-06-06 Jens Hornbostel , Valentina Kiritchenko

Let $A$ be an abelian compact Lie group and let $E$ be an oriented $A$-spectrum. We compute the $E$-homology of tom Dieck's homotopical $A$-equivariant complex bordism spectrum $MU_A$ in two ways, correcting an error in Cole-Greenlees-Kriz…

Algebraic Topology · Mathematics 2026-02-02 Julius Groenjes

Let X be a smooth projective rational variety carrying a regular action of a finite abelian group G. We give examples of effective computation of the Brauer group of the quotient stack [X/G] in dimensions 2 and 3 using residues in Galois…

Algebraic Geometry · Mathematics 2024-10-08 Alena Pirutka , Zhijia Zhang

Let A be a finite abelian group. We set up an algebraic framework for studying A-equivariant complex-orientable cohomology theories in terms of a suitable kind of equivariant formal groups. We compute the equivariant cohomology of many…

Algebraic Topology · Mathematics 2008-11-14 Neil P. Strickland

We give a simple and explicit presentation of the Z/2-equivariant complex cobordism ring.

Algebraic Topology · Mathematics 2014-11-11 N P Strickland

Given a magnetic finite group, we consider the similarity classes of magnetic equivariant central simple graded algebras over the complex numbers. We call this set the magnetic equivariant graded Brauer group and its structure as an abelian…

K-Theory and Homology · Mathematics 2026-05-19 Higinio Serrano , Bernardo Uribe

We prove that the ideal in complex cobordism ring $\MU^*$ generated by the polynomial generators $S=(x_1, x_k, k\geq 3)$ of $c_1$-spherical cobordism ring $W^*$, viewed as elements in $\MU^*$ by forgetful map is prime. Using the…

Algebraic Topology · Mathematics 2023-10-31 Malkhaz Bakuradze

We compute the rational Borel equivariant cohomology ring of a cohomogeneity-one action of a compact Lie group.

Algebraic Topology · Mathematics 2020-02-04 Jeffrey D. Carlson , Oliver Goertsches , Chen He , Augustin-Liviu Mare

For every finite abelian group $G$, there are positive integers $n$ and $d$ such that $G$ is isomorphic to the multiplicative group of $d$-th powers of reduced residues modulo $n$.

Number Theory · Mathematics 2022-11-22 Trevor D. Wooley
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