1.Some facts about regularizing pseudo-differential operators. 2.On the Schrodinger operator with singular complex potentials. 3.Nonlinear vibrating strings and the range of the sum of nonlinear operators. 4.Existence and regular of solutions of linear PDE’s. 5.Uniqueness in the Cauchy problems for first-order linear PDE’s. 6.On the equilibrium points of the equations. 7.Special functions and linear representations of Lie groups. 8.Smoothability of cherry flows on two-manifolds. 9.Variations in delays in difference and differential difference equations. 10.On a bifurcation problem. 11.Fredholm stieltjes-integral equations. 12.Total and integral stability for neutral functional differential equations. 13.Relationship between Lyapunov functional and nonlinear perturbed neutral functional differential equations. 14.Transitive mechanical systems. 15.A note on versal deformations and unfolding. 16.Clases de unicidad del problema de Cauchy para operadores de convolución. 17.Some problems connected with Navier-Stokes equations. 18.Division theorem for CK functions. 19.On a class of nonlinear PDE of mathematical physics. 20.Spaces between L1 and L and the Laplace transform. 21.An example for a Morse-Smale retarded functional differential equations. 22.On global solutions of a quasilinear hyperbolic equations. 23.An application of Frobenius theorem in a Banach scale. 24.The index of differential operators in Rn fedosov’s Formula.