Antolín Pichel, YagoCiobanu, LauraViles, Noelia2023-06-202023-06-2020121661-720710.4171/GGD/167https://hdl.handle.net/20.500.14352/43565Let F be a group whose abelianization is Zk, k 2. An element of F is called visible if its image in the abelianization is visible, that is, the greatest common divisor of its coordinates is 1. In this paper we compute three types of densities, annular, even and odd spherical, of visible elements in surface groups. We then use our results to show that the probability of a homogeneous equation in a surface group to have solutions is neither 0 nor 1, as the lengths of the right- and left-hand side of the equation go to infinity.engAtribución 3.0 Españahttps://creativecommons.org/licenses/by/3.0/es/journal articlehttps://doi.org/10.4171/GGD/167open access512Free groupsSurface groupsEquationsVisible elementsAsymptotic behavior.ÁlgebraGrupos (Matemáticas)1201 Álgebra