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Let $b$ be a block with normal abelian defect group and abelian inertial quotient. We prove that every Morita auto-equivalence of $b$ has linear source. We note that this improves upon results of Zhou and also Boltje, Kessar and…

Representation Theory · Mathematics 2020-02-04 Michael Livesey

Let B be a p-block of a finite group G with abelian defect group D such that S\unlhd G, S'=S, G/Z(S)\le\Aut(S) and S/Z(S) is a sporadic simple group. We show that B is isotypic to its Brauer correspondent in N_G(D) in the sense of Brou\'e.…

Representation Theory · Mathematics 2015-09-01 Benjamin Sambale

Moore's Conjecture is shown to hold for generalized moment-angle complexes and a criterion is proved that determines when a polyhedral product is elliptic or hyperbolic.

Algebraic Topology · Mathematics 2019-06-26 Yanlong Hao , Qianwen Sun , Stephen Theriault

We classify principal $2$-blocks of finite groups $G$ with Sylow $2$-subgroups isomorphic to a wreathed $2$-group $C_{2^n}\wr C_2$ with $n\geq 2$ up to Morita equivalence and up to splendid Morita equivalence. As a consequence, we obtain…

Representation Theory · Mathematics 2024-06-05 Shigeo Koshitani , Caroline Lassueur , Benjamin Sambale

In this paper, we show that the Alperin-McKay conjecture holds for 2-blocks of maximal defect. A major step in the proof is the verification of the inductive Alperin-McKay condition for the principal 2-block of groups of Lie type in odd…

Group Theory · Mathematics 2021-08-13 Julian Brough , Lucas Ruhstorfer

We prove an analogue of the fixed-point theorem for the case of definably amenable groups.

Logic · Mathematics 2017-11-15 Juan Felipe Carmona , Kevin Dávila , Alf Onshuus , Rafael Zamora

A group is called square-like if it is universally equivalent to its direct square. It is known that the class of all square-like groups admits an explicit first order axiomatization but its theory is undecidable. We prove that the theory…

Logic · Mathematics 2007-05-23 Oleg Belegradek

We will give a pure combinatorial proof of the Eisenbud-Goto conjecture for arbitrary monomial curves. Moreover, we will show that the conjecture holds for certain simplicial affine semigroup rings.

Commutative Algebra · Mathematics 2011-11-16 Max Joachim Nitsche

Sp\"ath showed that the Alperin-McKay conjecture in the representation theory of finite groups holds if the so-called inductive Alperin-McKay condition holds for all finite simple groups. In a previous article, we showed that the…

Representation Theory · Mathematics 2021-05-10 Lucas Ruhstorfer

We show that the cyclotomic Iwasawa--Greenberg Main Conjecture holds for a large class of modular forms with multiplicative reduction at $p$, extending previous results for the good ordinary case. In fact, the multiplicative case is deduced…

Number Theory · Mathematics 2016-06-22 Christopher Skinner

It was conjectured by H. Zassenhaus that a torsion unit of an integral group ring of a finite group is conjugate to a group element within the rational group algebra. The object of this note is the computational aspect of a method developed…

Group Theory · Mathematics 2007-05-23 V. Bovdi , C. Höfert , W. Kimmerle

In this paper, we will show that if for every nonlinear complex irreducible character of a finite group G, some multiple of it is induced from an irreducible character of some proper subgroup of G, then G is solvable. This is a…

Group Theory · Mathematics 2012-11-09 Tung Le , Jamshid Moori , Hung P. Tong-Viet

Hans Zassenhaus conjectured that every torsion unit of the integral group ring of a finite group $G$ is conjugate within the rational group algebra to an element of the form $\pm g$ with $g\in G$. This conjecture has been disproved recently…

Group Theory · Mathematics 2019-02-19 Mauricio Caicedo , Ángel del Río

We classify principal blocks of finite groups with semidihedral defect groups up to splendid Morita equivalence. This completes the classification of all principal $2$-blocks of tame representation type up to splendid Morita equivalence and…

Representation Theory · Mathematics 2020-10-19 Shigeo Koshitani , Caroline Lassueur , Benjamin Sambale

We prove the Banach strong Novikov conjecture for groups having polynomially bounded higher-order combinatorial functions. This includes all automatic groups.

K-Theory and Homology · Mathematics 2018-04-11 Alexander Engel

In this paper, we give a proof of Vogan's fundamental parallelepiped (FPP) conjecture for complex simple Lie groups, resulting in a reduction step in the classification of irreducible unitary representations for these groups.

Representation Theory · Mathematics 2024-07-24 Chao-Ping Dong , Kayue Daniel Wong

We prove that the Parker--Semeraro systems satisfy six of the nine Kessar--Linckelmann--Lynd--Semeraro weight conjectures for saturated fusion systems. As a by-product we obtain that Robinson's ordinary weight conjecture holds for the…

Representation Theory · Mathematics 2024-07-11 Radha Kessar , Jason Semeraro , Patrick Serwene , İpek Tuvay

H. Miyachi and W. Turner have independently proved that Broue's Abelian Defect Group Conjecture holds for certain unipotent blocks of the finite general linear group, the so-called Rouquier blocks. This together with A. Marcus and J. Chuang…

Representation Theory · Mathematics 2012-10-09 Michael Livesey

We calculate the Picard groups for principal blocks $B$ with TI defect groups and cyclic inertial quotient. The methods used generalize results on self stable equivalences and take advantage of the existence of equivalences given by Green…

Representation Theory · Mathematics 2021-01-20 Claudio Marchi

We show an invariance result for the L2-torsion of groups under uniform measure equivalence provided a measure-theoretic version of the determinant conjecture holds. The measure-theoretic determinant conjecture is discussed and, for…

Algebraic Topology · Mathematics 2010-04-20 Wolfgang Lueck , Roman Sauer , Christian Wegner