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math.CO2020
-quiddit{é} sur avec transcendant
Flavien Mabilat
As part of the study of Coxeter's friezes, M. Cuntz introduced the notion of irreducible -quiddity cycle. The objective of this note is to list all the irreducible -quiddity…
math.CO2020
Combinatoire des sous-groupes de congruence du groupe modulaire
Flavien Mabilat
In this paper, we study the combinatorics of congruence subgroups of the modular group by generalizing results obtained in the non-modular case. For this, we define a notion of irr…
math.CO2020★ 2 cited
Quelques éléments de combinatoire des matrices de
Flavien Mabilat
A Theorem of V.Ovsienko characterizes sequences of positive integers such that the -matrix $\begin{pmatrix} a_n & -1 \\ 1 & 0 \end{pmatrix}\cdots…