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15 papers · 1 filter
Double Ore Extensions versus Iterated Ore Extensions
Paula A. A. B. Carvalho, Samuel A. Lopes, Jerzy Matczuk
Motivated by the construction of new examples of Artin-Schelter regular algebras of global dimension four, J.J. Zhang and J. Zhang (2008) introduced an algebra extension $A_P[y_1,y…
Gibbs-Markov structures and limit laws for partially hyperbolic attractors with mostly expanding central direction
Jose F. Alves, Vilton Pinheiro
We consider a partially hyperbolic set on a Riemannian manifold whose tangent space splits as , for which the centre-unstable direction e…
Exact generation of acyclic deterministic finite automata
Marco Almeida, Nelma Moreira, Rogério Reis
We give a canonical representation for trim acyclic deterministic finite automata (Adfa) with n states over an alphabet of k symbols. Using this normal form, we present a backtrack…
An asymptotic universal focal decomposition for non-isochronous potentials
C. A. A. de Carvalho, M. M. Peixoto, D. Pinheiro +1
Galileo, in the XVII century, observed that the small oscillations of a pendulum seem to have constant period. In fact, the Taylor expansion of the period map of the pendulum is co…
Testing the Equivalence of Regular Languages
Marco Almeida, Nelma Moreira, Rogério Reis
The minimal deterministic finite automaton is generally used to determine regular languages equality. Antimirov and Mosses proposed a rewrite system for deciding regular expression…
Global embedding of the Kerr black hole event horizon into hyperbolic 3-space
G. W. Gibbons, C. A. R. Herdeiro, C. Rebelo
An explicit global and unique isometric embedding into hyperbolic 3-space, H^3, of an axi-symmetric 2-surface with Gaussian curvature bounded below is given. In particular, this al…