$\lambda$-quiddités sur des produits directs d'anneaux

The aim of this article is to continue the study of the notion of $\lambda$-quiddity over a ring, which appeared during the study of Coxeter’s friezes. For this, we will focus here on situations where the ring used can be seen as a direct product of unitary commutative rings. In particular, we will consider the cases of direct products of rings containing at least two rings of characteristic 0 and we will also consider some products of the type $\mathbb{Z}\mathrm{/}n\mathbb{Z}\times \mathbb{Z}\mathrm{/}m\mathbb{Z}$.