ETNAKent State University http://etna.math.kent.edu

The aim of this paper is to extend a previous work by Tatar and Zaraï [25] where an exponential decay result and a blow up result for solutions of the wave equation of Kirchhoff

Habiro con- siders an abelian group A k (H) dened by unitrivalent graphs with k trivalent vertices and with univalent vertices labelled by elements of H , subject to anti- symmetry,

We show that the fourth degree polynomials that satisfy Rolle’s Theorem in the unit ball of a real Hilbert space are dense in the space of polynomials that vanish in the unit

We give an elementary proof that, if the order of a horizontal s- form on a jet bundle does not increase under the operation of the horizontal differential, then the coefficients of

The main results in Section 1 allow us to give a simple proof of the following well known fact: if T is an Atkinson operator, then dim N (T − λI) (resp... Part (c) of this

Hankel determinant, Fekete-Szeg¨ o functional, positive real functionsc. ⃝2009 Universiteti i Prishtin¨ es, Prishtin¨ e,

The aim of the present note is to give one further illustration which underlies the central position of the class S and the following theorems proved in the same paper where

The separability of differential operators introduced by Everitt and Giertz in [7, 8] plays an important role in the study of second order differential equations.. In [9],