Eine Klassenzahlformel für singuläre Moduln der Picardschen Modulgruppen
Equations of hyperelliptic modular curves
We compute, in a unified way, the equations of all hyperelliptic modular curves. The main tool is provided by a class of modular functions introduced by Newman in 1957. The method uses the action of the hyperelliptic involution on the cusps.
Erratum à «Sur une conjecture de Kottwitz au bord»