output
20012022
most citedAutomated polyp detection in colon capsule endoscopy

306 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 2008Show all

14 papers · 1 filter

math.GR2008

Automorphic orbits in free groups: words versus subgroups

Pedro Silva, Pascal Weil

We show that the following problems are decidable in a rank 2 free group F_2: does a given finitely generated subgroup H contain primitive elements? and does H meet the orbit of a…

math.AG2008★ 62 cited

Higgs bundles and surface group representations in the real symplectic group

Oscar Garcia-Prada, Peter B. Gothen, Ignasi Mundet i Riera

In this paper we study the moduli space of representations of a surface group (i.e., the fundamental group of a closed oriented surface) in the real symplectic group Sp(2n,R). The…

math.AP2008★ 23 cited

On a doubly nonlinear diffusion model of chemotaxis with prevention of overcrowding

Mostafa Bendahmane, Raimund Brger, Ricardo Ruiz Baier +1

This paper addresses the existence and regularity of weak solutions for a fully parabolic model of chemotaxis, with prevention of overcrowding, that degenerates in a two-sided fash…

math.GR2008

On finite-index extensions of subgroups of free groups

Pedro Silva, Pascal Weil

We study the lattice of finite-index extensions of a given finitely generated subgroup of a free group . This lattice is finite and we give a combinatorial characterization…

math.DG2008★ 22 cited

Toric Kähler metrics seen from infinity, quantization and compact tropical amoebas

Thomas Baier, Carlos Florentino, José M. Mourão +1

We consider the metric space of all toric Kähler metrics on a compact toric manifold; when "looking at it from infinity" (following Gromov), we obtain the tangent cone at infinity,…

nlin.CD2008★ 12 cited

Dynamical estimates of chaotic systems from Poincaré recurrences

Murilo S. Baptista, Dariel M. Maranhao, Jose C. Sartorelli

We show that the probability distribution function that best fits the distribution of return times between two consecutive visits of a chaotic trajectory to finite size regions in…

math.DS2008★ 1 cited

Invariant measures for interval maps with critical points and singularities

Vitor Araujo, Stefano Luzzatto, Marcelo Viana

We prove that, under a mild summability condition on the growth of the derivative on critical orbits any piecewise monotone interval map possibly containing discontinuities and sin…

math.DS2008

Lorenz-like chaotic attractors revised

Vitor Araujo, Maria Jose Pacifico

We describe some recent results on the dynamics of singular-hyperbolic (or Lorenz-like) attractors: attractors in this class are expansive and so sensitive with respect to initial…

nlin.CD2008★ 24 cited

Optimal network topologies for information transmission in active networks

M. S. Baptista, J. X. de Carvalho, M. S. Hussein

This work clarifies the relation between network circuit (topology) and behavior (information transmission and synchronization) in active networks, e.g. neural networks. As an appl…

math.DS2008★ 6 cited

Hitting Time Statistics and Extreme Value Theory

Ana Cristina Moreira Freitas, Jorge Milhazes Freitas, Mike Todd

We consider discrete time dynamical systems and show the link between Hitting Time Statistics (the distribution of the first time points land in asymptotically small sets) and Extr…

gr-qc2008★ 2 cited

Spin Foam Perturbation Theory for Three-Dimensional Quantum Gravity

Joao Faria Martins, Aleksandar Mikovic

We formulate the spin foam perturbation theory for three-dimensional Euclidean Quantum Gravity with a cosmological constant. We analyse the perturbative expansion of the partition…

math.GT2008★ 25 cited

The Fundamental Crossed Module of the Complement of a Knotted Surface

João Faria Martins

We prove that if is a CW-complex and is its 1-skeleton then the crossed module depends only on the homotopy type of as a space, up to free products, in t…

math.DS2008★ 1 cited

Hamiltonian elliptic dynamics on symplectic 4-manifolds

Mario Bessa, Joao Lopes Dias

We consider C2 Hamiltonian functions on compact 4-dimensional symplectic manifolds to study elliptic dynamics of the Hamiltonian flow, namely the so-called Newhouse dichotomy. We s…

hep-th2008

Higher-order string effective actions and off-shell d=4 supergravity

Filipe Moura

We start by a concise yet thorough revision of four-dimensional superspace supergravity. We present curved superspace geometry, for arbitrary N, including torsion, curvature and Bi…