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Axial algebras of Monster type are a class of non-associative algebras which generalise the Griess algebra, whose automorphism group is the largest sporadic simple group, the Monster. The $2$-generated algebras, which are the building…

Rings and Algebras · Mathematics 2026-01-01 Justin McInroy , Abdul Wajid Mir

Axial algebras of Monster type are a class of commutative algebras generated by special idempotents called axes. Some motivating examples of these algebras are the Griess algebra and the Norton-Sakuma algebras, relating to the Monster…

Rings and Algebras · Mathematics 2026-05-19 Clara Franchi , Mario Mainardis , Justin McInroy , Michael Turner

Axial algebras are a class of commutative non-associative algebras which have a natural group of automorphisms, called the Miyamoto group. The motivating example is the Griess algebra which has the Monster sporadic simple group as its…

Rings and Algebras · Mathematics 2023-12-01 Ilya Gorshkov , Justin McInroy , Tendai Mudziiri Shumba , Sergey Shpectorov

Axial algebras are a class of non-associative commutative algebras whose properties are defined in terms of a fusion law. When this fusion law is graded, the algebra has a naturally associated group of automorphisms and thus axial algebras…

Rings and Algebras · Mathematics 2022-09-19 Justin McInroy , Sergey Shpectorov

Axial algebras are a recently introduced class of non-associative algebra, with a naturally associated group, which generalise the Griess algebra and some key features of the moonshine VOA. Sakuma's Theorem classifies the eight…

Rings and Algebras · Mathematics 2020-12-01 Justin McInroy

Axial algebras are a class of commutative algebras generated by idempotents, with adjoint action semisimple and satisfying a prescribed fusion law. Axial algebras were introduced by Hall, Rehren, and Shpectorov in 2015 as a broad…

Rings and Algebras · Mathematics 2023-01-02 Andrey Mamontov , Alexey Staroletov

In the first half of this paper, we define axial algebras: nonassociative commutative algebras generated by axes, that is, semisimple idempotents---the prototypical example of which is Griess' algebra [C85] for the Monster group. When…

Rings and Algebras · Mathematics 2015-06-26 J. I. Hall , F. Rehren , S. Shpectorov

Axial algebras are non-associative algebras generated by semisimple idempotents, known as axes, that all obey a fusion rule. Axial algebras were introduced by Hall, Rehren and Shpectorov as a generalisation of the axioms of Majorana theory,…

Rings and Algebras · Mathematics 2018-10-02 Madeleine Whybrow

Axial algebras are a class of commutative non-associative algebras generated by idempotents, called axes, with adjoint action semi-simple and satisfying a prescribed fusion law. Axial algebras were introduced by Hall, Rehren and Shpectorov…

Rings and Algebras · Mathematics 2021-04-09 Alexey Galt , Vijay Joshi , Andrey Mamontov , Sergey Shpectorov , Alexey Staroletov

An axial algebra $A$ is a commutative non-associative algebra generated by primitive idempotents, called axes, whose adjoint action on $A$ is semisimple and multiplication of eigenvectors is controlled by a certain fusion law. Different…

Rings and Algebras · Mathematics 2020-04-27 Justin McInroy , Sergey Shpectorov

Axial algebras are a class of non-associative algebra with a strong link to finite (especially simple) groups which have recently received much attention. Of primary interest are the axial algebras of Monster type $(\alpha, \beta)$, of…

Rings and Algebras · Mathematics 2022-05-05 Clara Franchi , Mario Mainardis , Justin McInroy

We introduce axial representations and modules over axial algebras as new tools to study axial algebras. All known interesting examples of axial algebras fall into this setting, in particular the Griess algebra whose automorphism group is…

Rings and Algebras · Mathematics 2019-05-07 Tom De Medts , Michiel Van Couwenberghe

We provide the basic setup for the project, initiated by Felix Rehren, aiming at classifying all 2-generated axial algebras of Monster type $(\alpha,\beta)$ over a field $\mathbb F$. Using this, we first show that every such algebra has…

Rings and Algebras · Mathematics 2024-10-14 Clara Franchi , Mario Mainardis , Sergey Shpectorov

Axial algebras are non-associative algebras generated by semisimple idempotents whose adjoint actions obey a fusion law. Axial algebras that are generated by two such idempotents play a crucial role in the theory. We classify all primitive…

Rings and Algebras · Mathematics 2020-05-08 Madeleine Whybrow

We study axial algebras, that is, commutative non-associative algebras generated by idempotents whose adjoint actions are semisimple and obey a fusion law. Considering the case, when said adjoint actions having $3$ eigenvalues and the…

Rings and Algebras · Mathematics 2024-10-04 Vsevolod A. Afanasev

Recently Takahiro Yabe gave an almost complete classification of primitive symmetric $2$-generated axial algebras of Monster type. In this note, we construct a new infinite-dimensional primitive $2$-generated symmetric axial algebra of…

Rings and Algebras · Mathematics 2022-03-09 Clara Franchi , Mario Mainardis

The notion of axial algebra is closely related to $3$-transposition groups, the Monster group and vertex operator algebras. In this work we continue our previous works and compete the proof that all algebras generated by a set of primitive…

Rings and Algebras · Mathematics 2021-12-02 Louis Rowen , Yoav Segev

We introduce decomposition algebras as a natural generalization of axial algebras, Majorana algebras and the Griess algebra. They remedy three limitations of axial algebras: (1) They separate fusion laws from specific values in a field,…

Rings and Algebras · Mathematics 2020-08-26 Tom De Medts , Simon F. Peacock , Sergey Shpectorov , Michiel Van Couwenberghe

In our first paper, we looked at $2$-generated primitive axial algebras of Monster type with skew axet $X'(1+2)$. We continue our work by focusing on larger skew axets and classifying all such algebras with skew axets. This brings us one…

Rings and Algebras · Mathematics 2024-08-19 Michael Turner

The conjugacy classes of the Monster which occur in the McKay observation correspond to the isomorphism types of certain 2-generated subalgebras of the Griess algebra. Sakuma, Ivanov and others showed that these subalgebras match the…

Rings and Algebras · Mathematics 2015-10-05 Felix Rehren
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