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Small divisors in the problem of the convergence of generalized power series solutions of -difference equations
Renat Gontsov, Irina Goryuchkina, Alberto Lastra
The question of the convergence of generalized formal power series (with complex power exponents) solutions of -difference equations is studied in the situation where the small…
On the convergence of exotic formal series solutions of an ODE. A proof by the implicit mapping theorem
Renat Gontsov, Irina Goryuchkina
We propose a sufficient condition of the convergence of a complex power type formal series of the form , where are functions mero…
Linear Differential Systems with Small Coefficients: Various Types of Solvability and their Verification
Moulay A. Barkatou, Renat R. Gontsov
We study the problem of solvability of linear differential systems with small coefficients in the Liouvillian sense (or, by generalized quadratures). For a general system, this pro…
On the convergence of an exotic formal series solution of an ODE
Renat Gontsov, Irina Goryuchkina
A sufficient condition of the convergence of an exotic formal series (a kind of power series with complex exponents) solution to an ODE of a general form is proposed.
A note on the convergence of multivariate formal power series solutions of meromorphic Pfaffian systems
Renat Gontsov, Irina Goryuchkina
Here we present some compliments to theorems of Gerard and Sibuya, on the convergence of multivariate formal power series solutions of nonlinear meromorphic Pfaffian systems. Their…