In this paper we use the concept of numerical range to characterize best
approximation points in closed convex subsets of B(H): Finally by using this
method we give also a useful characterization of best approximation in
closed convex subsets of a C*-algebra A.
AbstractWe give a new method of proof for a result of D. Pierre-Loti-Viaud and P. Boulongne which can be seen as a generalization of a characterization of Poisson law due to Rényi and Srivastava. We also provide explicit formulas, in terms of Bell polynomials, for the moments of the compound distributions occurring in the extended collective model in non-life insurance.
We present a new method to study doubly charged molecules relying on high-resolution spectroscopy of the singly charged parent cation, and report on the first spectroscopic characterization of a thermodynamically stable diatomic dication, MgAr2+.
Spectroscopic characterization of a thermodynamically stable doubly charged diatomic molecule: MgAr2+