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Transfer systems are a combinatorial model for $N_{\infty}$-operads, which encode commutative structures in equivariant homotopy theory. Blumberg--Hill and Chan gave criteria for when two transfer systems are a compatible pair, meaning they…

Algebraic Topology · Mathematics 2026-04-02 David DeMark , Michael A. Hill , Yigal Kamel , Nelson Niu , Kurt Stoeckl , Danika Van Niel , Guoqi Yan

In this article, we apply the recently developed theory of transfer systems to study the relationship between $G$-equivariant linear isometries and infinite little discs operads, for a finite group $G$. This framework allows us to reduce…

Algebraic Topology · Mathematics 2026-01-23 Euan Aitken

Tambara functors are an equivariant generalization of rings that appear as the homotopy groups of genuine equivariant commutative ring spectra. In recent work, Blumberg and Hill have studied the corresponding algebraic structures, called…

Algebraic Topology · Mathematics 2024-01-31 David Chan

Transfer systems are combinatorial objects which classify $N_\infty$ operads up to homotopy. By results of A. Blumberg and M. Hill, every transfer system associated to a linear isometries operad is also saturated (closed under a particular…

Algebraic Topology · Mathematics 2021-09-20 Usman Hafeez , Peter Marcus , Kyle Ormsby , Angélica Osorno

For an equivariant commutative ring spectrum $R$, $\pi_0 R$ has algebraic structure reflecting the presence of both additive transfers and multiplicative norms. The additive structure gives rise to a Mackey functor and the multiplicative…

Algebraic Topology · Mathematics 2021-04-22 Andrew J. Blumberg , Michael A. Hill

We prove a new case of Rubin's saturation conjecture about the realization of $G$-transfer systems, for $G$ a finite cyclic group, by linear isometries $N_\infty$-operads, namely the case of cyclic groups of order $p^nq^m$ for $p,q$…

Algebraic Topology · Mathematics 2025-07-15 Julie Bannwart

We investigate the combinatorial data arising from the classification of equivariant homotopy commutativity for cyclic groups of order $G=C_{p_1 \cdots p_n}$ for $p_i$ distinct primes. In particular, we will prove a structural result which…

Algebraic Topology · Mathematics 2020-01-17 Scott Balchin , Daniel Bearup , Clelia Pech , Constanze Roitzheim

For a finite group $G$, a Tambara functor on $G$ is regarded as a $G$-bivariant analog of a commutative ring. In this article, we consider a $G$-bivariant analog of the ideal theory for Tambara functors.

Category Theory · Mathematics 2011-03-22 Hiroyuki Nakaoka

For a finite group $G$, the notion of a $G$-transfer system provides homotopy theorists with a combinatorial way to study equivariant objects. In this paper, we focus on the properties of transfer systems for non-abelian groups. We…

Algebraic Topology · Mathematics 2026-04-24 Sarah Klanderman , Chloe Lewis , Harlea Monson , Koki Shibata , Danika Van Niel

For a finite group $G$, $G$-transfer systems are combinatorial objects which encode the homotopy category of $G$-$N_\infty$ operads, whose algebras in $G$-spectra are $E_\infty$ $G$-spectra with a specified collection of multiplicative…

Algebraic Topology · Mathematics 2021-06-22 Evan E. Franchere , Kyle Ormsby , Angélica M Osorno , Weihang Qin , Riley Waugh

Let $L$ denote the Laplacian matrix of a graph $G$. We study continuous quantum walks on $G$ defined by the transition matrix $U(t)=\exp\left(itL\right)$. The initial state is of the pair state form, $e_a-e_b$ with $a,b$ being any two…

Combinatorics · Mathematics 2020-09-07 Qiuting Chen , Chris Godsil

Transfer Maps, sometimes called norm maps, for Milnor's $K$-theory were first defined by Bass and Tate (1972) for simple extensions of fields via tame symbol and Weil's reciprocity law, but their functoriality had not been settled until…

K-Theory and Homology · Mathematics 2009-06-29 Sung Myung

In this paper, we construct incomplete versions of the equivariant stable category; i.e., equivariant stabilization of the category of $G$-spaces with respect to incomplete systems of transfers encoded by an $N_\infty$ operad $\mathcal{O}$.…

Algebraic Topology · Mathematics 2021-02-17 Andrew J. Blumberg , Michael A. Hill

We provide a general recursive method for constructing transfer systems on finite lattices. Using this we calculate the number of homotopically distinct $N_\infty$ operads for dihedral groups $D_{p^n}$, $p > 2$ prime, and cyclic groups…

Algebraic Topology · Mathematics 2024-06-14 Scott Balchin , Ethan MacBrough , Kyle Ormsby

In this paper we connect the well established discrete frame theory of generalized shift invariant systems to a continuous frame theory. To do so, we let $\Gamma_j$, $j \in J$, be a countable family of closed, co-compact subgroups of a…

Functional Analysis · Mathematics 2015-04-22 Mads Sielemann Jakobsen , Jakob Lemvig

Two groups $L_1$ and $L_2$ are compatible if there exists a finite group $G$ with isomorphic normal subgroups $N_1$ and $N_2$ such that $L_1\cong G/N_1$ and $L_2\cong G/N_2$. In this paper, we give new necessary conditions for two groups to…

Group Theory · Mathematics 2025-01-16 Zhaochen Ding , Gabriel Verret

We present a class of one-to-one matching models with perfectly transferable utility. We discuss identification and inference in these separable models, and we show how their comparative statics are readily analyzed.

Econometrics · Economics 2021-02-05 Alfred Galichon , Bernard Salanié

This article provides an account of the functorial correspondence between irreducible singular $G$-monopoles on $S^1\times \Sigma$ and $\vec{t}$-stable meromorphic pairs on $\Sigma$. The main theorem of [1] is thus generalized here from…

Differential Geometry · Mathematics 2015-11-26 Benjamin H. Smith

Bi-incomplete Tambara functors are equivariant generalizations of commutative rings. The most common forms of bi-incomplete Tambara functors are coefficient systems of commutative rings, Green functors, and Tambara functors. In the 1980s,…

Algebraic Topology · Mathematics 2026-05-11 Scott Balchin , J. D. Quigley , Ben Spitz

Given a finite group $G$ and a commutative ring $G$-spectrum $R$, we study the separable commutative algebras in the category of compact $R$-modules. We isolate three conditions on the geometric fixed points of $R$ which ensure that every…

Algebraic Topology · Mathematics 2026-05-28 Niko Naumann , Luca Pol , Maxime Ramzi
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