Codice  QDD185 
Titolo  Positive solutions with a complex behavior for superlinear indefinite ODEs on the real line 
Data  20140708 
Autore/i  Barutello,V.; Boscaggin, A.; Verzini, G. 
Link  Download full text 
Abstract  We show the existence of infinitely many positive solutions, defined on the real line,for the nonlinear scalar ODE ....,where a is a periodic,
signchanging function, and the parameter ? > 0 is large. Such solutions are characterized by the fact of being either small or large in each interval of positivity of a. In this way, we find periodic solutions, having minimal period arbitrarily large, and bounded nonperiodic solutions, exhibiting a complex behavior. The proof is variational, exploiting suitable natural constraints of Nehari type.

