Now showing items 1-8 of 8
Difference equations with delays depending on time
(Boletim da Sociedade Brasileira de Matemática, 1990-03-01) [Artigo]
For linear difference equations with coefficients and delays varying in time, sufficient conditions are given, in the scalar case, the zero solution to be stable. © 1990 Sociedade Brasileira de Matemática.
Objetos intencionais e existência objetiva
(Trans/Form/Ação, 1991-12-01) [Artigo]
Neste artigo quero apontar para a possibilidade de uma ontologia da matemática que, mesmo mantendo alguns pontos em comum com o platonismo e com o construtivismo, desliga-se destes em outros pontos essenciais. Por objeto ...
On the number of singularities in generic deformations of map germs
(Journal of the London Mathematical Society-second Series, 1998-08-01) [Artigo]
Let f:C-n, 0 --> C-p, 0 be a K-finite map germ, and let i = (i(1),..., i(k)) be a Boardman symbol such that Sigma(i) has codimension n in the corresponding jet space J(k)(n, p). When its iterated successors have codimension ...
On the Betti number of the union of two generic map images
(Topology and its Applications, 1999-06-23) [Artigo]
Let f: M --> N and g: K --> N be generic differentiable maps of compact manifolds without boundary into a manifold such that their intersection satisfies a certain transversality condition. We show, under a certain ...
Husserl's phenomenology and Weyl's predictivism
(Synthese, 1997-02-01) [Artigo]
In this paper I discuss the version of predicative analysis put forward by Hermann Weyl in Das Kontinuum. I try to establish how much of the underlying motivation for Weyl's position may be due to his acceptance of a ...
On dichotomic maps for non autonomous discrete equations
(Dynamics of Continuous Discrete and Impulsive Systems, 1997-09-01) [Artigo]
A new procedure is given for the study of stability and asymptotic stability of the null solution of the non autonomous discrete equations by the method of dichotomic maps, which it includes Liapunov's Method asa special ...
Finite group actions on products of spheres
(Manuscripta Mathematica, 1996-12-01) [Artigo]
In this work we make some contributions to the theory of actions of finite groups on products of spheres. Suppose that the group Z(q)(tau) acts freely on the product of k copies of spheres. Question: Is r less than or equal ...
BIFURCATIONS OF GENERIC ONE-PARAMETER FAMILIES OF FUNCTIONS ON FOLIATED MANIFOLDS
(Mathematica Scandinavica, 1993-01-01) [Artigo]