works in the theory of differential equations and its applications.
He obtained several outstanding results in the qualitative theory of differential equations,
mainly for non-autonomous systems.
He achieved important results in the theory of partial stability of dynamical systems.
He developed new mathematical tools for studying
the stability of non-autonomous second order nonlinear differential equations.
The computer-assisted proof of chaotic behavior in the forced damped pendulum equation
by him and his coauthors has generated a great deal of international interest.
Since 1971 Professor Hatvani has published 13 definitive scientific papers
in Acta Scientiarum Mathematicarum.
The Medal was be presented to László Hatvani
at 11:00, november 22, 2019
in the Bolyai Hall of the Bolyai Institute.
On this occasion he delivered a lecture on
``Finite and infinite Fermi-Pasta-Ulam chains with damping".