This article generalizes recent results in the extra invariance for shift-invariant spaces to the context of LCA groups. Let G be a locally compact abelian (LCA) group and K a closed subgroup of G. A closed subspace of ...

We study the Hardy space of translated Dirichlet series H+. It consists on those Dirichlet series ∑ ann-s such that for some (equivalently, every) 1 ≤ p< ∞, the translation ∑ann-(s+1σ) belongs to the Hardy space Hp for ...

A network of high‐frequency (HF) transmitters and receivers used for ionospheric specification is being installed in Peru. The HF transmitters employ multiple frequencies and binary phase coding with pseudorandom noise, ...

Tchakaloff’s theorem gives a quadrature formula for polynomials of a given degree with respect to a compactly supported positive measure which is absolutely continuous with respect to Lebesgue measure. We study the validity ...

We study the geometry of Lie groups G with a continuous Finsler metric, in presence of a subgroup K such that the metric is right-invariant for the action of K. We present a systematic study of the metric and geodesic ...

Atom interferometry provides extremely sensitive and accurate tools for the measurement of inertial forces. Op- eration of atom interferometers in microgravity is expected to enhance the performance of such sensors. This ...