Sérgio Tadao Martins

collaborators

3 papers

math.AT2019

The group Aut and Out of the fundamental group of a closed Sol 3-manifold

Daciberg Lima Gonçalves, Sérgio Tadao Martins

Let $E$ be the fundamental group of a closed Sol 3-manifold. We describe the groups $A u t (E)$ and $O u t (E)$ . We first consider the case where $E$ is the fundamental group of a torus…

cs.DM2016

Discrete Calculus of Finite Sequences

Sérgio Martins Filho

The calculus of finite differences is a solid foundation for the development of operations such as the derivative and the integral for infinite sequences. Here we showed a way to e…

math.AT2016

The cohomology ring of certain families of periodic virtually cyclic groups

Sérgio Tadao Martins, Daciberg Lima Gonçalves, Márcio de Jesus Soares

Let G be a virtually cyclic of the form (Z_a x Z_b) x Z or [Z_a x (Z b x Q_{2^i})] x Z. We compute the integral cohomology ring of G, and then obtain the periodicity of the Farell…