We study an extension to Krein spaces of the abstract interpolating spline problem in Hilbert spaces, introduced by M. Atteia. This is a quadratically constrained quadratic programming problem, where the objective function ...

We prove that the quadratic second quantization of an operator p on L-2(R-d) boolean AND L-infinity(R-d) is an orthogonal projection on the quadratic Fock space if and only if p is a multiplication operator by a characteristic ...

In this paper we study the action of planar birational transformations, also known as plane Cremona maps, on quadratic planar differential systems. We provide geometrical characterizations of when a quadratic system is ...

Smart grid schemes in which multiple network elements and participants are managed for the benefit of the distribution network (e.g., energy loss reduction, restoration, etc.) require sophisticated algorithms to control ...

We aimed to designate which is the best quadrat area to be used in sampling of C. fluminea for determination of their population parameters. The quadrat of 0.0625 m2 showed the best cost efficiency and a lowest sampling ...

Let F be a field of characteristic 2. Let ΩFn be the F-space of absolute differential forms over F. There is a homomorphism ℘: ΩFn → ΩFn/dΩFn-1 given by ℘ (x dx1/x1 ∧ ⋯ ∧ dxn/xn) = (x2-x)dx1/x1 ∧ ⋯ ∧ dxn/xn mod dΩFn-1. Let ...