2019
Том 71
№ 7

# Kallel N.

Articles: 1
Article (English)

### Subharmonics of a Nonconvex Noncoercive Hamiltonian System

Ukr. Mat. Zh. - 2003. - 55, № 11. - pp. 1459-1466

We study the problem of the existence of multiple periodic solutions of the Hamiltonian system $$J\dot x + u\nabla G\left( {t,u\left( x \right)} \right) = e\left( t \right),$$ where u is a linear mapping, G is a C 1-function, and e is a continuous function.