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Formal orbifolds are defined in higher dimension. Their \'etale fundamental groups are also defined. It is shown that the fundamental groups of formal orbifolds have certain finiteness property and it is also shown that they can be used to…

Algebraic Geometry · Mathematics 2017-06-02 Manish Kumar

Submersions with definite folds are submersions on manifolds with boundary whose restrictions to the boundary are definite fold maps. In this paper, we study the properties from the viewpoint of differential topology of manifolds with…

Geometric Topology · Mathematics 2026-04-30 Koki Iwakura

The Linearization Theorem for proper Lie groupoids organizes and generalizes several results for classic geometries. Despite the various approaches and recent works on the subject, the problem of understanding invariant linearization…

Differential Geometry · Mathematics 2021-08-20 Matias del Hoyo , Mateus de Melo

An orbifold is a topological space modeled on quotient spaces of a finite group actions. We can define the universal cover of an orbifold and the fundamental group as the deck transformation group. Let $G$ be a Lie group acting on a space…

Geometric Topology · Mathematics 2007-05-23 Suhyoung Choi

General criteria are given for when an embedding of a Mori dream space into another satisfies certain nice combinatorial conditions on some of their associated cones. An explicit example of such an embedding is studied.

Algebraic Geometry · Mathematics 2012-02-15 John Levitt

The kinematical part of general theory of deformational structures on smooth manifolds is developed. We introduce general concept of d-objects deformation, then within the set of all such deformations we develop some special algebra and…

High Energy Physics - Theory · Physics 2007-05-23 Sergey S. Kokarev

Motivated by the theory of Inoue-type varieties, we give a structure theorem for projective manifolds $W_0$ with the property of admitting a 1-parameter deformation where $W_t$ is a hypersurface in a projective smooth manifold $Z_t$. Their…

Algebraic Geometry · Mathematics 2018-03-28 Fabrizio Catanese , Yongnam Lee

In convex geometry, the constructions that assign to a convex body its difference body, projection body, or volume have the following properties: They are (1) invariant under volume-preserving linear changes of coordinates; (2) continuous;…

Metric Geometry · Mathematics 2024-02-12 Jakob Henkel , Thomas Wannerer

In this paper, we introduce a new set of modular-invariant phase factors for orbifolds with trivially-acting subgroups, analogous to discrete torsion and generalizing quantum symmetries. After describing their basic properties, we…

High Energy Physics - Theory · Physics 2022-02-18 D. Robbins , E. Sharpe , T. Vandermeulen

We define formal orbifolds over an algebraically closed field of arbitrary characteristic as curves together with some branch data. Their \'etale coverings and their fundamental groups are also defined. These fundamental group approximates…

Algebraic Geometry · Mathematics 2015-12-11 Manish Kumar , A. J. Parameswaran

A Riemannian orbifold is a mildly singular generalization of a Riemannian manifold that is locally modeled on $R^n$ modulo the action of a finite group. Orbifolds have proven interesting in a variety of settings. Spectral geometers have…

Combinatorics · Mathematics 2019-05-29 Kathleen Daly , Colin Gavin , Gabriel Montes de Oca , Diana Ochoa , Elizabeth Stanhope , Sam Stewart

Tractably modelling distributions over manifolds has long been an important goal in the natural sciences. Recent work has focused on developing general machine learning models to learn such distributions. However, for many applications…

Machine Learning · Statistics 2022-01-31 Isay Katsman , Aaron Lou , Derek Lim , Qingxuan Jiang , Ser-Nam Lim , Christopher De Sa

We calculate the integral equivariant cohomology, in terms of generators and relations, of locally standard torus orbifolds whose odd degree ordinary cohomology vanishes. We begin by studying GKM-orbifolds, which are more general, before…

Algebraic Topology · Mathematics 2020-12-04 Alastair Darby , Shintaro Kuroki , Jongbaek Song

We generalize our elliptic characterization of Oka manifolds to Oka maps. The generalized characterization can be considered as an affirmative answer to the relative version of Gromov's conjecture. As an application, we unify previously…

Complex Variables · Mathematics 2022-12-13 Yuta Kusakabe

In this paper, we show that there is a close relationship between generalized subtangent manifolds and Lie groupoids. We obtain equivalent assertions among the integrability conditions of generalized almost subtangent manifolds, the…

Geometric Topology · Mathematics 2012-11-02 Fulya Sahin

We extend the construction of [19] by introducing spaces of generalized tensor fields on smooth manifolds that possess optimal embedding and consistency properties with spaces of tensor distributions in the sense of L. Schwartz. We thereby…

Functional Analysis · Mathematics 2012-05-31 Michael Grosser , Michael Kunzinger , Roland Steinbauer , James Vickers

This paper is mainly about an early result that the orbifold stack is globally representable via some $ \infty $-categorical techniques.

Algebraic Geometry · Mathematics 2021-09-07 Jiajun Dai

This paper provides an introduction to exploded manifolds. The category of exploded manifolds is an extension of the category of smooth manifolds with an excellent holomorphic curve theory. Each exploded manifold has a tropical part which…

Symplectic Geometry · Mathematics 2017-09-14 Brett Parker

Holomorphic manifolds over Cayley-Dickson algebras are defined and their embeddings and immersions are studied.

Algebraic Geometry · Mathematics 2018-12-18 S. V. Ludkovsky

We study the space of generalized translation invariant valuations on a finite-dimensional vector space and construct a partial convolution which extends the convolution of smooth translation invariant valuations. Our main theorem is that…

Differential Geometry · Mathematics 2017-06-22 Andreas Bernig , Dmitry Faifman