Periodic Boundary Value Problem for Firs
✍
Ignacio Bajo; Eduardo Liz
📂
Article
📅
1996
🏛
Elsevier Science
🌐
English
⚖ 125 KB
In this paper we show the validity of the method of upper and lower solutions to obtain an existence result for a periodic boundary value problem of first order impulsive differential equations at variable times.