RT Journal Article T1 The Schubert triangle geometry on an algebraic surface A1 Sols LucĂ­a, Ignacio A1 Hermoso, Carlos AB For a smooth complex projective surface, and for two families of curves with traditional singularities in it, we enumerate the pairs of curves in each family having two points of contact among them, thus generalizing the double contact formulae known or conjectured by Zeuthen and Schubert in the case of the complex projective plane. The technique we use to this purpose is a particular notion of triangle which can he defined in any smooth surface, thus potentially generalizing to arbitrary surfaces the Schubert technique of triangles. PB Taylor & Francis SN 0092-7872 YR 2006 FD 2006 LK https://hdl.handle.net/20.500.14352/50530 UL https://hdl.handle.net/20.500.14352/50530 LA eng NO Spanish Ministry of Education and Science DS Docta Complutense RD 6 abr 2025