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This paper studies cutting and pasting groups (SK-groups) of pairs of manifolds. By a pair of manifolds we mean a manifold with a submanifold of strictly smaller dimension. Existing results in the unoriented category by Komiya are…

Algebraic Topology · Mathematics 2025-06-19 R. A. Vlierhuis

We introduce a parametrized version of scissors congruence $K$-theory of manifolds with tangential structure, which includes a topologized version of the scissors congruence $K$-theory of oriented manifolds as a special case. We examine the…

Algebraic Topology · Mathematics 2026-04-03 Mona Merling , George Raptis , Julia Semikina

Recent work of Jonathan Campbell and Inna Zakharevich has focused on building machinery for studying scissors congruence problems via algebraic $K$-theory, and applying these tools to studying the Grothendieck ring of varieties. In this…

Algebraic Topology · Mathematics 2021-12-07 Renee S. Hoekzema , Mona Merling , Laura Murray , Carmen Rovi , Julia Semikina

A generic smooth map of a closed $2k$-manifold into $(3k-1)$-space has a finite number of cusps ($\Sigma^{1,1}$-singularities). We determine the possible numbers of cusps of such maps. A fold map is a map with singular set consisting of…

Geometric Topology · Mathematics 2007-05-23 Tobias Ekholm , Andras Szucs , Tamas Terpai

A classic result of Anderson, Brown, and Peterson states that the cobordism spectrum MSpin (respectively, MSpin$^c$) splits as a sum of Eilenberg--Mac Lane spectra and connective covers of real K-theory (respectively, complex K-theory) at…

Algebraic Topology · Mathematics 2026-02-25 Jonathan Buchanan , Stephen McKean

Let P be a connected smooth p-manifold. We describe the group of all cobordism classes of smooth maps of n-manifolds to P with singularities of a given $cal K$-invariant class in terms of certain stable homotopy groups by applying the…

Geometric Topology · Mathematics 2008-05-14 Yoshifumi Ando

It has been proposed that cobordism and K-theory groups, which can be mathematically related in certain cases, are physically associated to generalised higher-form symmetries. As a consequence, they should be broken or gauged in any…

High Energy Physics - Theory · Physics 2023-04-12 Ralph Blumenhagen , Niccolò Cribiori , Christian Kneissl , Andriana Makridou

V.V. Sharko in his papers and books has investigated functions on manifolds and cobordism. Braids intimately connect with functions on manifolds. These connections are represented by mapping class groups of corresponding discs, by…

Geometric Topology · Mathematics 2022-07-18 Nikolaj Glazunov

In this paper we introduce the notion of an assembler, which formally encodes "cutting and pasting" data. An assembler has an associated $K$-theory spectrum, in which $\pi_0$ is the free abelian group of objects of the assembler modulo the…

K-Theory and Homology · Mathematics 2016-09-21 Inna Zakharevich

Cut-and-paste $K$-theory has recently emerged as an important variant of higher algebraic $K$-theory. However, many of the powerful tools used to study classical higher algebraic $K$-theory do not yet have analogues in the cut-and-paste…

K-Theory and Homology · Mathematics 2023-09-15 Anna Marie Bohmann , Teena Gerhardt , Cary Malkiewich , Mona Merling , Inna Zakharevich

We introduce a scissors congruence $K$-theory spectrum which lifts the equivariant scissors congruence groups for compact $G$-manifolds with boundary, and we show that on $\pi_0$ this is the source of a spectrum level lift of the Burnside…

Algebraic Topology · Mathematics 2025-08-18 Mona Merling , Ming Ng , Julia Semikina , Alba Sendón Blanco , Lucas Williams

This work considers the computation of controllable cut-and-paste groups $\mathrm{SKK}^{\xi}_n$ of manifolds with tangential structure $\xi:B_n\to BO_n$. To this end, we apply the work of Galatius-Madsen-Tillman-Weiss, Genauer and…

Algebraic Topology · Mathematics 2025-04-11 Renee S. Hoekzema , Luuk Stehouwer , Simona Veselá

This monograph studies $KK$-theory in its unbounded model. The central object is the $KK$-bordism group obtained by imposing the $KK$-bordism relation on unbounded $KK$-cycles. In the paradigm of noncommutative geometry, an unbounded…

K-Theory and Homology · Mathematics 2026-03-30 Robin J. Deeley , Magnus Goffeng , Bram Mesland

Recent work has applied scissors congruence $K$-theory to study classical cut-and-paste ($SK$) invariants of manifolds. This paper proves the conjecture that the squares $K$-theory of equivariant $SK$-manifolds arises as the fixed points of…

K-Theory and Homology · Mathematics 2026-04-22 Maxine Calle , David Chan

We consider branched coverings which are simple in the sense that any point of the target has at most one singular preimage. The cobordism classes of $k$-fold simple branched coverings between $n$-manifolds form an abelian group…

Geometric Topology · Mathematics 2017-07-11 Csaba Nagy

The aim of this paper is to give an $s$-cobordism classification of topological $4$-manifolds in terms of the standard invariants using the group of homotopy self-equivalences. Hambleton and Kreck constructed a braid to study the group of…

Geometric Topology · Mathematics 2019-09-27 Friedrich Hegenbarth , Mehmetcik Pamuk , Dušan Repovš

We give a proof of the cobordism invariance of the index of elliptic pseudodifferential operators on sigma-compact manifolds, where, in the non-compact case, the operators are assumed to be multiplication outside a compact set. We show…

K-Theory and Homology · Mathematics 2016-09-07 Catarina Carvalho

We define a simplicial category called the category of derived manifolds. It contains the category of smooth manifolds as a full discrete subcategory, and it is closed under taking arbitrary intersections in a manifold. A derived manifold…

Algebraic Topology · Mathematics 2019-12-19 David I. Spivak

We prove a relative statement about the slices of the algebraic cobordism spectrum. If the map from MGL to a certain quotient of MGL introduced by Hopkins and Morel is the map to the zero-slice then a relative version of Voevodsky's…

Algebraic Geometry · Mathematics 2009-05-27 Markus Spitzweck

In this paper we show that for m>n the set of cobordism classes of maps from m-sphere to n-sphere is trivial. The determination of the cobordism homotopy groups of spheres admits applications to the covers for spheres.

Algebraic Topology · Mathematics 2018-06-26 Oleg R. Musin , Jie Wu
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