The COVID-19 crisis places an unprecedented strain on industry already characterised by poor mental health due to challenging working conditions, including the difficulty of sustaining a living, anti-social hours, exhaustion, and inability plan time future. This article discusses current conditions musicians in dealing with exceptional situation through retrospective perspective those affected....

one studies the $hx$-hypergroups, corresponding to the chinese hypergroups associated with the direct products of some ${bf z}/n {bf z},$ calculating their fuzzy grades.

We study in this paper a generalization of the notion of a discrete hypergroup with particular emphasis on the relation with systems of orthogonal polynomials. The concept of a locally compact hypergroup was introduced by Dunkl [8], Jewett [12] and Spector [25]. It generalizes convolution algebras of measures associated to groups as well as linearization formulae of classical families of orthog...