Existence of positive solutions for a second order periodic boundary value problem with impulsive effects
Existence of positive solutions for a second order periodic boundary value problem with impulsive effects
In this paper, we are mainly concerned with the existence and multiplicity of positive solutions for the following second order periodic boundary value problem involving impulsive effects $$ \begin{cases} -u''+\rho^2u=f(t,u), & t\in J',\\ -\Delta u'|_{t=t_k}=I_k(u(t_k)), & k=1,\ldots,m,\\ u(0)-u(2\pi)=0,\quad u'(0)-u'(2\pi)=0. \end{cases} $$ Here $J'=J\setminus \{t_1,\ldots, t_m\}$, $f\in C(J\times \mathbb{R}^+, \mathbb{R}^+)$, $I_k\in …