Brazilian Institute of Geography and Statistics

output

20052026

most citedZipf Law for Brazilian Cities

76 citations

researchers with a paper here

Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.

collaborating institutions

Showing 2021Show all

5 papers · 1 filter

math.GR2021★ 4 cited

Crystallographic groups and flat manifolds from surface braid groups

Daciberg Lima Gonçalves, John Guaschi, Oscar Ocampo +1

Let $M$ be a compact surface without boundary, and $n \geq 2$ . We analyse the quotient group $B_{n} (M) / Γ_{2} (P_{n} (M))$ of the surface braid group $B_{n} (M)$ by the commutator subgroup $Γ…

math.GT2021

The Borsuk-Ulam property for homotopy classes of maps between the torus and the Klein bottle -- part 2

Daciberg Lima Gonçalves, John Guaschi, Vinicius Casteluber Laass

Let $M$ be a topological space that admits a free involution $τ$ , and let $N$ be a topological space. A homotopy class $β \in [M, N]$ is said to have the Borsuk-Ulam property with…

math.DS2021

Typical coexistence of infinitely many strange attractors

Pablo G. Barrientos, Juan David Rojas

We prove that the coexistence of infinitely many prevalent Hénon-like phenomena is Kolmogorov typical in sectional dissipative $C^{d, r}$ -Berger domains of parameter families of dif…

math.DS2021★ 4 cited

There exist transitive piecewise smooth vector fields on $S^{2}$ but not robustly transitive

Rodrigo D Euzébio, Joaby S. Jucá, Régis Varão

It is well known that smooth (or continuous) vector fields cannot be topologically transitive on the sphere $§^{2}$ . Piecewise-smooth vector fields, on the other hand, may present no…

math.AP2021★ 2 cited

Energy estimates and convergence of weak solutions of the porous medium equation

Renato De Paula, Patrícia Gonçalves, Adriana Neumann

We study the convergence of the weak solution of the porous medium equation with a type of Robin boundary conditions, by tuning a parameter either to zero or to infinity. The conve…

Crystallographic groups and flat manifolds from surface braid groups

The Borsuk-Ulam property for homotopy classes of maps between the torus and the Klein bottle -- part 2

Typical coexistence of infinitely many strange attractors

There exist transitive piecewise smooth vector fields on S2 but not robustly transitive

Energy estimates and convergence of weak solutions of the porous medium equation

There exist transitive piecewise smooth vector fields on $S^{2}$ but not robustly transitive