This paper gives the existence of a duck solution in a slow-fast system in R2+2 using two ways. One is an indirect way and the other is a direct way. In the ind
We consider linear partial differential equations of first order on a region . We will see that we can write the equation in partial derivatives as an Fredholm
In this paper, we consider the existence of multiple solutions to the Kirchhoff problems with critical potential, critical exponent and a concave term. Our main