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In this paper, all irreducible weight modules with finite dimensional weight spaces over the twisted Heisenberg-Virasoro algebra are determined. There are two different classes of them. One class is formed by simple modules of intermediate…

Representation Theory · Mathematics 2019-08-09 Rencai Lu , Kaiming Zhao

We give an explicit simple construction for classifying spaces of maps obtained as hyperplane projections of immersions. We prove structure theorems for these classifying spaces.

Geometric Topology · Mathematics 2019-02-27 András Szűcs , Tamás Terpai

This paper concerns a study of three families of non-compact type symmetric spaces of infinite dimension. Although they have infinite dimension they have finite rank. More precisely, we show they have finite telescopic dimension. We also…

Differential Geometry · Mathematics 2021-04-21 Bruno Duchesne

We classify flips of buildings arising from non-degenerate unitary spaces of dimension at least 4 over finite fields of odd characteristic in terms of their action on the underlying vector space. We also construct certain geometries related…

Group Theory · Mathematics 2010-12-13 Rieuwert J. Blok , Benjamin Carr

Recent results of Grepstad and Lev are used to show that weighted cut-and-project sets with one-dimensional physical space and one-dimensional internal space are bounded distance equivalent to some lattice if the weight function $h$ is…

Metric Geometry · Mathematics 2021-04-20 Dirk Frettlöh , Alexey Garber

We construct classifying $\infty$-topoi by showing that the $(\infty,2)$-category of topoi has weighted limits. We show that several prestacks of interest have a classifying topos, including the prestack of spectra.

Category Theory · Mathematics 2026-01-29 Ivan Di Liberti , Nicholas Meadows

We give a summary on spectral techniques for finite dimensional algebras and study its link to singularity theory. In particular, we offer a contribution to the categorification of the Milnor lattice of two-dimensional singularities through…

Representation Theory · Mathematics 2008-05-08 Helmut Lenzing , Jose Antonio de la Pena

We classify some special classes of non-rational Fano threefolds with terminal singularities. In particular, all such hyperelliptic and trigonal varieties are found.

Algebraic Geometry · Mathematics 2019-07-15 Yuri Prokhorov

We classify projective manifolds with flat holomorphic conformal structures.

Algebraic Geometry · Mathematics 2015-03-02 Priska Jahnke , Ivo Radloff

We consider minimal compactifications of the complex affine plane. Minimal compactifications of the affine plane with at most log canonical singularities are classified. Moreover, every minimal compactification of the affine plane with at…

Algebraic Geometry · Mathematics 2025-05-21 Masatomo Sawahara

In this note, we extend the quasi-projective dimension of finite (that is, finitely generated) modules to homologically finite complexes, and we investigate some of homological properties of this dimension.

Commutative Algebra · Mathematics 2017-08-16 Tirdad Sharif

Toric quiver varieties (moduli spaces of quiver representations) are studied. Given a quiver and a weight there is an associated quasiprojective toric variety together with a canonical embedding into projective space. It is shown that for a…

Representation Theory · Mathematics 2014-02-21 M. Domokos , Dániel Joó

In this paper we study plus-one generated arrangements of conics and lines in the complex projective plane with simple singularities. We provide several degree-wise classification results that allow us to construct explicit examples of such…

Algebraic Geometry · Mathematics 2025-07-11 Anca Măcinic , Piotr Pokora

We present a local classification of smooth projective surfaces in 3-space via projective transformations in accordance with singularity types of central projections up to codimension 4. We also discuss relations between our classification…

Differential Geometry · Mathematics 2016-09-28 Hiroaki Sano , Yutaro Kabata , Jorge Luiz Deolindo Silva , Toru Ohmoto

We introduce the notion of negative topological dimension and the notion of weight for the asymptotic topological dimension. Quantizing of spaces of negative dimension is applied to linguistic statistics.

General Mathematics · Mathematics 2007-05-23 V. P. Maslov

Complex tight frames can be canonically viewed as elements of a complex Stiefel manifold. We present a class of spaces of such frames which are simply connected relative to the subspace topology. To this class belongs the space of finite…

Functional Analysis · Mathematics 2026-05-19 Augustin-Liviu Mare

A recent paper showed how to find sets of finite affine or projective planes constructed on a common set of points, so that lines of one plane meet lines of a different plane in at most two points. In this paper, those results are…

Combinatorics · Mathematics 2024-03-20 Mark Saaltink

For any (n+1)-dimensional weight vector {\chi} of positive integers, the weighted projective space P(\chi) is a projective toric variety, and has orbifold singularities in every case other than CP^n. We study the algebraic topology of…

Algebraic Topology · Mathematics 2014-04-29 Anthony Bahri , Matthias Franz , Nigel Ray

Many classes of projective algebraic varieties can be studied in terms of graded rings. Gorenstein graded rings in small codimension have been studied recently from an algebraic point of view, but the geometric meaning of the resulting…

Algebraic Geometry · Mathematics 2007-05-23 Alessio Corti , Miles Reid

Classification theory and the study of projective varieties which are covered by rational curves of minimal degrees naturally leads to the study of families of singular rational curves. Since families of arbitrarily singular curves are hard…

Algebraic Geometry · Mathematics 2007-05-23 Stefan Kebekus