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This paper introduces the cyclic subfactors, generalizing the cyclic groups as the subfactors generalize the groups, and generalizing the natural numbers as the maximal subfactors generalize the prime numbers. On one hand, a theorem of O.…

Operator Algebras · Mathematics 2016-07-05 Sebastien Palcoux

This article proves that an irreducible subfactor planar algebra with a distributive biprojection lattice admits a minimal 2-box projection generating the identity biprojection. It is a generalization (conjectured in 2013) of a theorem of…

Operator Algebras · Mathematics 2023-06-06 Sebastien Palcoux

We characterize those finite groups for which the bounded derived category of finite dimensional representations over an algebraically closed field of characteristic $p$ has distributive lattice of thick subcategories: they are precisely…

Representation Theory · Mathematics 2026-05-01 Sira Gratz , Greg Stevenson

We extend the Euler's totient function (from arithmetic) to any irreducible subfactor planar algebra, using the Mobius function of its biprojection lattice, as Hall did for the finite groups. We prove that if it is nonzero then there is a…

Operator Algebras · Mathematics 2018-03-30 Sebastien Palcoux

This paper gives a self-contained group-theoretic proof of a dual version of a theorem of Ore on distributive intervals of finite groups. We deduce a bridge between combinatorics and representations in finite group theory.

Group Theory · Mathematics 2019-03-12 Sebastien Palcoux

The main purpose of this paper is to classify exchange relation planar algebras with 4 dimensional 2-boxes. Besides its skein theory, we emphasize the positivity of subfactor planar algebras based on the Schur product theorem. We will…

Operator Algebras · Mathematics 2016-05-26 Zhengwei Liu

We prove that the lattice of normal subgroups of ultraproducts of compact simple non-abelian groups is distributive. In the case of ultraproducts of finite simple groups or compact connected simple Lie groups of bounded rank the set of…

Group Theory · Mathematics 2014-02-26 Abel Stolz , Andreas Thom

In this note, we show that among finite nilpotent groups of a given order or finite groups of a given odd order, the cyclic group of that order has the minimum number of edges in its cyclic subgroup graph. We also conjecture that this holds…

Group Theory · Mathematics 2023-02-14 Marius Tărnăuceanu

If $G$ is a countable, discrete group generated by two finite subgroups $H$ and $K$ and $P$ is a II$_1$ factor with an outer G-action, one can construct the group-type subfactor $P^H \subset P \rtimes K$ introduced in \cite{BH}. This…

Operator Algebras · Mathematics 2009-03-26 Dietmar Bisch , Paramita Das , Shamindra Kumar Ghosh

Suppose $C(G)$ denotes the set of all cyclic subgroups of a finite group $G$, and $\mathcal{O}_{2}(G)$ denotes the number of elements of order $2$ in $G$. In [Marius T., Finite groups with a certain number of cyclic subgroups. The American…

Group Theory · Mathematics 2025-08-08 Vaibhav Chhajer , Sumana Hatui , Palash Sharma

We prove that the subgroup graph of a finite group $G$ is regular if and only if $G$ is cyclic with square-free order.

Group Theory · Mathematics 2025-04-17 Andrea Lucchini

In a finite group, a subset is called a Lagrange subset if its size divides the group order, and a factor if it admits a complementary subset. We provide a new and comparatively direct proof of the classification of groups in which every…

Group Theory · Mathematics 2025-12-30 Mikhail Kabenyuk

A group $G$ is said to be $\frac{3}{2}$-generated if every nontrivial element belongs to a generating pair. It is easy to see that if $G$ has this property then every proper quotient of $G$ is cyclic. In this paper we prove that the…

Group Theory · Mathematics 2021-02-02 Timothy C. Burness , Robert M. Guralnick , Scott Harper

We classify all subgroups of $SO(3)$ that are generated by two elements, each a rotation of finite order, about axes separated by an angle that is a rational multiple of $\pi$. In all cases we give a presentation of the subgroup. In most…

Group Theory · Mathematics 2018-07-11 Charles Radin , Lorenzo Sadun

We prove that if every Schmidt subgroup of a group $G$ is subnormal or modular, then $G/F(G)$ is cyclic

Group Theory · Mathematics 2023-04-11 Victor S. Monakhov , Irina L. Sokhor

We introduce a family of toric algebras defined by maximal chains of a finite distributive lattice. Applying results on stable set polytopes we conclude that every such algebra is normal and Cohen-Macaulay, and give an interpretation of its…

Commutative Algebra · Mathematics 2024-03-13 Oleksandra Gasanova , Lisa Nicklasson

We show that a subfactor planar algebra of finite depth $k$ is generated by a single $s$-box, for $s \leq min\{k+4,2k\}$.

Operator Algebras · Mathematics 2014-10-09 Vijay Kodiyalam , Srikanth Tupurani

There is a natural construction which associates to a finitely generated, countable, discrete group $G$ and a 3-cocycle $\omega$ of $G$ an inclusion of II$_1$ factors, the so-called diagonal subfactors (with cocycle). In the case when the…

Operator Algebras · Mathematics 2008-12-30 Dietmar Bisch , Paramita Das , Shamindra Kumar Ghosh

A classical theorem of Wonenburger, Djokovic, Hoffmann and Paige states that an element of the general linear group of a finite-dimensional vector space is the product of two involutions if and only if it is similar to its inverse. We give…

Rings and Algebras · Mathematics 2023-03-03 Clément de Seguins Pazzis

We describe an explicit finite presentation for a finite depth subfactor planar algebra. We also show that such planar algebras are singly generated with the generator subject to finitely many relations.

Operator Algebras · Mathematics 2010-03-25 Vijay Kodiyalam , Srikanth Tupurani
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