Showing 2020Show all
2 papers · 1 filter
math.CO2020
Coxeter invariants for non-negative unit forms of Dynkin type A
Jesús Arturo Jiménez González
Two integral quadratic unit forms are called strongly Gram congruent if their upper triangular Gram matrices are Z-congruent. The paper gives a combinatorial strong Gram invariant…
math.CO2020
A graph theoretical framework for the strong Gram classification of non-negative unit forms of Dynkin type A
Jesus Arturo Jimenez Gonzalez
In the context of signed line graphs, this article introduces a modified inflation technique to study strong Gram congruence of non-negative (integral quadratic) unit forms, and us…