We give a characterization of monic polynomials with coefficients in the ring of integers of a Galois number field having all of their roots on the unit circle. Such a characterization is given in terms of finitely many sum of…

We prove space-time parabolic Besov regularity in terms
of integrability of Besov norms in the space variable for solutions of the
heat equation on cylindrical regions based on Lipschitz domains.

Accepted: The Journal of Fourier Analysis and Applications. January…

The class of NPc-lattices is introduced as a quasivariety of commutative residuated lattices, and it is shown that the class of pairs $(\A, A^+)$ such that $\A$ is an NPc-lattice and $A^+$ is its positive cone, is a matrix semantics…

In this note we give sufficient conditions on two dyadic systems on a space of homogeneous type in order to obtain the equivalence of corresponding Haar systems on Lebesgue spaces. The main tool is the vector valued Fefferman-Stein inequality for…

Abstract: Surface diffusion is a (4th order highly nonlinear) geometric driven motion of a surface with normal velocity proportional to the surface Laplacian of mean curvature. We present a novel variational formulation for parametric surfaces with or without boundaries. The…

In this paper we present some results on the time integration stability when solving fluid/structure interaction problems with strong coupled staged strategies. The flutter of a flat plate faced with a fluid at Mach between 1.8 and 3 is taken…

In this paper we present a numerical solution for the mathematical modeling of the hot-pressing process applied to medium density fiber- board. The model is based in the work of Humphrey [1982], Humphrey and Bolton [1989] and Carvalho and Costa…

In this article we prove that it is possible to construct, using newest-vertex bisection, meshes that equidistribute the error in $H^1$-norm, whenever the function to approximate can be decomposed as a sum of a regular part plus a singular part…

We prove that for each $n\geq 4$ there is an analytic function
$F_n(x)$ satisfying an algebraic differential equation of degree
$n+1$ such that the logarithmic Mahler measure of the linear form
$\lf_n=x_1+\cdots + x_n$ can be essentially computed as…

Free algebras with an arbitrary number of free generators in varieties of BL-algebras generated by one BL-chain which is an ordinal sum of a finite MV-chain ${\bf L}_n$ and a generalized BL-chain ${\bf B}$ are described in terms of weak…