Certain words on the real projective line
The authors give complete proofs of their results announced in [C. R. Acad. Sci., Paris, Sér. I 313, 483-485 (1991; Zbl 0742.11013)] and \textit{F. Laubie} [ibid. 565-567 (1991; Zbl 0768.11024)]. This is a pleasant paper playing with words, namely Christoffel and Lyndon words. They link substitutions acting on infinite Christoffel words with the action of \(\text{SL}_2 (\mathbb{Z})\) on the projective real line.
scientific article; zbMATH DE number 484160