[PDF][PDF] The Dynkin type of a non-negative unit form

M Barot, JA de la Peña - Expositiones Mathematicae, 1999 - Citeseer
Unit forms appear in different fields of mathematics. Our motivation comes from unit forms
associated to algebraic structures such as Lie algebras, finite dimensional algebras and …

On posets of width two with positive Tits form

VM Bondarenko, MV Styopochkina - 2005 - dspace.luguniv.edu.ua
Journal Algebra Discrete Math. Page 1 Journal Algebra Discrete Math. Algebra and Discrete
Mathematics RESEARCH ARTICLE Number 2. (2005). pp. 20 – 35 cO Journal “Algebra and …

Hecke algebras of classical type and their representation type

S Ariki - Proceedings of the London Mathematical Society, 2005 - cambridge.org
The purpose of this article is to determine the representation type for all of the Hecke
algebras of classical type. To do this, we combine methods from our previous work, which is …

A Strong Gram Classification of Non-negative Unit Forms of Dynkin Type 𝔸 r

JA Jiménez González - Fundamenta Informaticae, 2024 - content.iospress.com
An integral quadratic form q: ℤ n→ ℤ is usually identified with a bilinear form 𝕓∨ q: ℤ n× ℤ
n→ ℤ satisfying q (x)= 𝕓∨ q (x, x) for any vector x in ℤ n, and such that its Gram matrix with …

[HTML][HTML] A polynomial recognition of unit forms using graph-based strategies

J Alves, D Castongay, T Brüstle - Discrete Applied Mathematics, 2019 - Elsevier
The units forms are algebraic expressions that have important role in representation theory
of algebras. We identified that existing algorithms have exponential time complexity for …

Algebras whose derived category is tame

JA De la Pe a - Contemporary Mathematics, 1998 - books.google.com
Let A be a finite dimensional algebra over an algebraically closed field k. In recent years the
consideration of the derived category D"(A) of the category mod A of (left-) modules over A …

[PDF][PDF] Algebras whose Euler form is non-negative

M Barot, J de la Peña - Colloquium Mathematicum, 1999 - bibliotekanauki.pl
Introduction. Let A be a finite-dimensional algebra over an algebraically closed field k. We
denote by modA the category of finite-dimensional left A-modules and by Db (A) the derived …

[PDF][PDF] On finiteness of critical Tits forms of posets

VM Bondarenko, AM Polishchuck - Proc. Inst. Math. NAS Ukraine, 2004 - slac.stanford.edu
In the paper we consider the Tits form of (finite and infinite) posets. We call such a form
critical (with respect to positivity) if it is not positive but each of its proper subform is positive …

Isotropic vectors of non-negative integral quadratic forms

H Von Hoehne, JA de la Peña - European Journal of Combinatorics, 1998 - Elsevier
We say that an integral quadratic formq: Z n→ Z of the shape q (x)=∑ ni= 1q ix (i) 2+∑ i< jq
ijx (i)×(j) is a semi-unit form ifqi≤ 1 for every 1≤ i≤ n. A deflation forqis the linear …

A strong Gram classification of non-negative unit forms of Dynkin type A

JAJ Gonzalez - Fundamenta Informaticae, 2024 - fi.episciences.org
An integral quadratic form q: Zn Ñ Z is usually identified with a bilinear form qq: Zn ˆ Zn Ñ Z
satisfying qpxq “qqpx, xq for any vector x in Zn, and such that its Gram matrix with respect to …