

Seminar on analytic theory of differential equations
April 27, 2016 14:30, Moscow, Steklov Mathematical Institute, Room 440 (8 Gubkina)






A search for solutions of linear differential systems of an arbitrary order with formal power series coefficients
S. A. Abramov^{} 
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Abstract:
We investigate problems of the construction of Lorent, regular and exponentiallylogarithmic solutions of linear differential systems of full rank. We assume that the system coefficients are formal power series defined algorithmically. A system may have an arbitrary order.
It is shown that the first two problems are solvable algorithmically, and the third is not. We give a simplified version of the third porblem which is algorithmically solvable:
if a given system $S$ and a nonnegative integer $d$ are such that for $S$ one has $d$ linear independent solutions, then we can construct them algorithmically.

