Higher order geodesic symmetries
Bioestadística y la rama de ciencias de la salud.
Some fsubsigma-sets in L(E,F) for the weak operator topology
The Order of Points on the Second Convex Hull of a Simple Polygon.
Generalisations of some properties of invariant polynomials with matrix arguments
Some extensions of the properties of invariant polynomials proved by Davis (1980), Chikuse (1980), Chikuse and Davis (1986) and Ratnarajah et al. (2005) are given for symmetric and Hermitian matrices.
Non-archimedean Hilbert spaces and adjoint operators
Strongly prime alternative pairs with minimal inner ideals.
Historical Comments on Monge’s Ellipsoid and the Configurations of Lines of Curvature on Surfaces
This is an essay on the historical landmarks leading to the study of principal confgurations on surfaces in R^3 , their structural stability and further generalizations. Here it is pointed out that in the work of Monge, 1796, are found elements of the qualitative theory of differential equations, founded by Poincaré in 1881. Recent development concerning the space R^4 are mentioned. Two open problems are proposed at the end.
The failure of orthogonality under nonstationarity: should we care about it?
Generalized nonlinear superposition principles for polynomial planar vector fields.
Calendario para averiguar el día de la semana de cualquier fecha desde 1600 a 1999.
Aplicaciones del Álgebra de Boole métrica a la Teoría de la Medida.
On characterizing the Pólya distribution
In this paper two characterizations of the Pólya distribution are obtained when its contagion parameter is negative. One of them is based on mixtures and the other one is obtained by characterizing a subfamily of the discrete Pearson system.
Homotopy colimits and cohomology with local coefficients
Note on stability estimation in sequential hypothesis testing
We introduce a quantitative measure Δ of stability in optimal sequential testing of two simple hypotheses about a density of observations: f=f₀ versus f=f₁. The index Δ represents an additional cost paid when a stopping rule optimal for the pair (f₀,f₁) is applied to test the hypothesis f=f₀ versus a "perturbed alternative" f=f̃₁. An upper bound for Δ is established in terms of the total variation distance between f₁(X)/f₀(X) and f̃₁(X)/f₀(X) with X∼f₀.
Reduced commutative monoids with two Archimedean components
Si studiano i monoidi commutativi ridotti con due componenti archimedee e si forniscono dei teoremi di strutture. Si presta particolare attenzione a quei monoidi che sono finitamente generati, e si danno degli algoritmi che permettono di ottenere informazioni a partire da un delle loro presentazioni.
Semigroup-theoretical characterizations of arithmetical invariants with applications to numerical monoids and Krull monoids
Arithmetical invariants—such as sets of lengths, catenary and tame degrees—describe the non-uniqueness of factorizations in atomic monoids.We study these arithmetical invariants by the monoid of relations and by presentations of the involved monoids. The abstract results will be applied to numerical monoids and to Krull monoids.
On characterizing the Pólya distribution
In this paper two characterizations of the Pólya distribution are obtained when its contagion parameter is negative. One of them is based on mixtures and the other one is obtained by characterizing a subfamily of the discrete Pearson system.
Numerical semigroups with a monotonic Apéry set
We study numerical semigroups with the property that if is the multiplicity of and is the least element of congruent with modulo , then . The set of numerical semigroups with this property and fixed multiplicity is bijective with an affine semigroup and consequently it can be described by a finite set of parameters. Invariants like the gender, type, embedding dimension and Frobenius number are computed for several families of this kind of numerical semigroups.
Jacobians of certain transformations of singular matrices
In this study various Jacobians of transformations of singular random matrices are found. An alternative proof of Uhlig's first conjecture (Uhlig (1994)) is proposed. Furthermore, we propose various extensions of this conjecture under different singularities. Finally, an application of the theory of singular distributions is discussed.
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