## Multipeak solutions to the Bahri-Coron problem in domains with a shrinking hole.(English)Zbl 1236.35044

Summary: We construct positive and sign changing multipeak solutions to the pure critical exponent problem in a bounded domain with a shrinking hole, having a peak which concentrates at some point inside the shrinking hole (i.e. outside the domain) and one or more peaks which concentrate at interior points of the domain. These are, to our knowledge, the first multipeak solutions in a domain with a single small hole.

### MSC:

 35J60 Nonlinear elliptic equations 35J25 Boundary value problems for second-order elliptic equations 35B33 Critical exponents in context of PDEs 47J30 Variational methods involving nonlinear operators 58E05 Abstract critical point theory (Morse theory, Lyusternik-Shnirel’man theory, etc.) in infinite-dimensional spaces 35R05 PDEs with low regular coefficients and/or low regular data
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