Abstract
In this paper, we consider the Choquard equations with a local perturbation where . By using variational method and approximating approach, we prove that for any given positive integer k, the above equation has a least energy radial solution changing sign exactly k times. This solution is constructed as the limit of such solutions for the following Choquard equations as . Our result improves and extends the previous results in the literature.
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Disclosure statement
No potential conflict of interest was reported by the author(s).