The Existence Of Infinitely Many Sign-changing Solutions For Nonlinear Choquard Equations

In this thesis,by using the method of invariant sets of descending flow and the method of truncation,we mainly study the existence of infinitely many sign-changing solutions of nonlinear Choquard equations.The three chapters are as follows.In Chapter one,we mainly introduce the physical background and the current research progress of the Choquard equation,as well as the preliminary results and notations needed in the whole thesis.In Chapter two,we study the following semilinear Choquard equation where N?3,N-4