Let T(n,i) be the set of all trees with order n and matching number i.We determine the third to sixth trees in T(2i + 1,i) and the third to fifth trees in T(n,i
The additive mappings that preserve the minimal rank on the algebra of all n × n upper triangular matrices over a field of characteristic 0 are characteriz
In this paper,we deal with a Dirichlet problem for linear elliptic equations related to Gauss measure.For this problem,we study the converse of some inequalitie