2 problems

Let $\mu_q$ be the $q$-analog of the monoid homomorphism used to define $q$-Markoff numbers, and let $\mu_q(w)_{12}\in\mathbb{Z}[q]$ denote the corresponding entry above the diagon…

Let $\mu:\\{\mathtt{0},\mathtt{1}\\}^*\to\mathrm{SL}_2(\mathbb{Z})$ be the monoid homomorphism defined by … A Christoffel word is a word over $\\{\mathtt{0},\mathtt{1}\\}$ in the u…