On conjugacy functions of second-order linear differential equations
On conjugacy of high-order linear ordinary differential equations.
On conjugate points of solutions of non-selfadjoint differential systems
On equation of finite type, 1-special, with the same central dispersion of the first kind
On existence of oscillatory solution of the system of differential equations
On fundamental systems for differential equations of Kamke type.
On general solutions of linear differential equations.
On generalized periodic solutions of linear differential equations of order n
On global transformations of ordinary differential equations of the second order
The paper describes the general form of an ordinary differential equation of the second order which allows a nontrivial global transformation consisting of the change of the independent variable and of a nonvanishing factor. A result given by J. Aczél is generalized. A functional equation of the form is solved on for ,
On Halphen and Laguerre-Forsyth canonical forms of linear differential equations
On index theorems for linear ordinary differential operators
We introduce and study the sheaf of Deligne to describe singular points of a linear differential operator and we develop a technique based on homological algebra to prove index theorems for .As particular cases, we obtain index theorems for acting in spaces of multisummable series and a new proof of the index theorem of Malgrange in the space of convergent power series and of the index theorems of Ramis in the spaces of Gevrey series.We compute the values of these indices in terms of the formal...
On linear differential equations involving a para-Grassmann variable.
On linear singular functional-differential equations in a functional space.
On Lyapunov stability of linear systems of generalized ordinary differential equations.
On Lyapunov transformations of linear systems of implicit differential equations
On minimizing the sum of squares of norms of differential operators under constraints
On monotone solutions of the fourth order ordinary differential equations
On th order differential equations over Hardy fields
On ordinary linear -adic differential equations with algebraic function coefficients
On oscillation, continuation, and asymptotic expansions of solutions of linear differential equations