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In this paper homology stability for unitary groups over a ring with finite unitary stable rank is established. Homology stability of symplectic groups and orthogonal groups appears as a special case of our results.

K理论与同调 · 数学 2007-05-23 Behrooz Mirzaii , Wilberd van der Kallen

In this note the homology stability problem for hyperbolic unitary groups over a local ring with an infinite residue field is studied.

K理论与同调 · 数学 2007-05-23 Behrooz Mirzaii

We prove a slope 1 stability range for the homology of the symplectic, orthogonal and unitary groups with respect to the hyperbolic form, over any fields other than $F_2$, improving the known range by a factor 2 in the case of finite…

代数拓扑 · 数学 2020-05-06 David Sprehn , Nathalie Wahl

We improve, by a factor of 2, known homology stability ranges for the integral homology of symplectic groups over commutative local rings with infinite residue field and show that the obstruction to further stability is bounded below by…

K理论与同调 · 数学 2026-01-14 Marco Schlichting

The problem of homological stability helps us to catch the structure of group homology. We calculate homological stability of special orthogonal groups, and we also calculate the stability of orthogonal groups with determinant-twisted…

K理论与同调 · 数学 2015-11-04 Masayuki Nakada

Associated to every group with a weak spherical Tits system of rank n+1 with an appropriate rank n subgroup, we construct a relative spectral sequence involving group homology of Levi subgroups of both groups. Using the fact that such Levi…

K理论与同调 · 数学 2012-09-05 Jan Essert

We study the homological stability of spin mapping class groups of surfaces and of quadratic symplectic groups using cellular $E_2$-algebras. We get improvements in their stability results, which for the spin mapping class groups we show to…

代数拓扑 · 数学 2026-02-11 Ismael Sierra

In this paper, we prove stability results about orthogonal groups over finite commutative rings where 2 is a unit. Inspired by Putman and Sam (2017), we construct a category $\mathbf{OrI}(R)$ and prove a Noetherianity theorem for the…

表示论 · 数学 2023-12-14 Zifan Wang , Arun S. Kannan

In this paper we prove stability results for the homology of the mapping class group of a surface. We get a stability range that is near optimal, and extend the result to twisted coefficients.

代数拓扑 · 数学 2009-04-22 Søren K. Boldsen

We prove a general homological stability theorem for certain families of groups equipped with product maps, followed by two theorems of a new kind that give information about the last two homology groups outside the stable range. (These…

代数拓扑 · 数学 2020-07-13 Richard Hepworth

We prove homological stability for standard unitary groups over R, C and H and for general linear groups over skew-fields with infinite centre. We focus on the similarities and differences of these proofs. Both proofs are due to Chih-Han…

K理论与同调 · 数学 2008-03-31 Jan Essert

We establish homological stability for automorphisms of symmetric bilinear forms over a class of principal ideal domains that includes all fields, the integers, the Gaussian integers, and the Eisenstein integers. In conjunction with…

代数拓扑 · 数学 2026-03-06 Vikram Nadig

We use algebraic arc complexes to prove a homological stability result for symplectic groups with slope 2/3 for rings with finite unitary stable rank. Symplectic groups are here interpreted as the automorphism groups of formed spaces with…

代数拓扑 · 数学 2025-11-07 Ismael Sierra , Nathalie Wahl

We prove homological stability for both general linear groups of modules over a ring with finite stable rank and unitary groups of quadratic modules over a ring with finite unitary stable rank. In particular, we do not assume the modules…

代数拓扑 · 数学 2017-03-29 Nina Friedrich

In this article, we extend an argument of Vogtmann in order to show homology stability of the Euclidean orthogonal group $O_n(A)$ when $A$ is a valuation ring subject to arithmetic conditions on either its residue or its quotient field. In…

代数拓扑 · 数学 2026-04-22 Oscar Harr

In this article we introduce the space of configurations of commuting elements in a topological group and show that it satisfies rational homological stability for the sequences of unitary, special unitary and symplectic groups. We also…

代数拓扑 · 数学 2022-01-11 José Cantarero , Ángel R. Jiménez

We prove that the homology of the mapping class groups of non-orientable surfaces stabilizes with the genus of the surface. Combining our result with recent work of Madsen and Weiss, we obtain that the classifying space of the stable…

几何拓扑 · 数学 2009-11-11 Nathalie Wahl

The conditions for stability of the elements of linear groups over the associative rings with identity and their connection with the stability of rings are analyzed in the article. The stability of rings which are commutative, satisfy the…

K理论与同调 · 数学 2010-03-23 V. M. Petechuk

The Higman--Thompson groups $V_{n,r}$ consist of piecewise linear automorphisms of $r$ intervals where cut points and slopes are $n$-adic. Szymik and Wahl prove homological stability for this family of groups as $r$ increases, and compute…

代数拓扑 · 数学 2026-01-29 Marie-Camille Delarue

The homology groups of the automorphism group of a free group are known to stabilize as the number of generators of the free group goes to infinity, and this paper relativizes this result to a family of groups that can be defined in terms…

几何拓扑 · 数学 2014-11-11 Allen Hatcher , Nathalie Wahl
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