• Groups as automorphisms of dessins d’enfants 

      Cañas Muñoz, Alejandro; Hidalgo, Rubén A.; Turiel-Sandin, Francisco Javier; Viruel-Arbaizar, Antonio Angel (Springer, 2022-08-01)
      It is known that every finite group can be represented as the full group of automorphisms of a suitable compact dessin d’enfant. In this paper, we give a constructive and easy proof that the same holds for any countable ...
    • Realisability problems in Algebraic Topology 

      Mendez Martinez, David (UMA Editorial, 2020-02-24)
      Realisability problems in Algebraic Topology are very easy to state and extremely hard to solve. Three classic examples of this are: the realisability of cohomology algebras, proposed by N. E. Steenrod in the 1960s, which ...