腾讯会议 ID:589-212-623
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In this talk, we shall report some recent results for existence of solutions of semilinear subelliptic Dirichlet problem with a free perturbation term. Combining the perturbation from symmetry method with the approaches involving eigenvalue estimate and Morse index in estimating the min-max values, we obtain two kinds of existence results for multiple weak solutions to the problem above. Furthermore, we discuss the difference between the eigenvalue estimate approach and the Morse index approach in degenerate situations. Compared with the classical elliptic cases, both approaches here have their own strengths in the degenerate cases.