Moreira, Helmar Nunes; Araujo, Ricardo Azevedo - Volkswirtschaftliche Fakultät, … - 2011
In this paper it is shown that an extended evolutionary system proposed by Hofbauer and Sigmund (1998) may be transformed into a Kukles system. Then a Dulac-Cherkas function related to the Kukles system is derived, which allows us to determine the number of limit cycles or its non-existence.