There exists a set U in the plane, such that elements of U correspond to minimal stable solutions of a two-parameter elliptic system. For points on the boundary ϒ of U, there exist weak solutions to the elliptic system. The paper studies the properties of the curve ϒ. 2000 Mathematics Subject Classification 35J55, 35B05, 35K50, 35K55.
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Marcelo Montenegro (2005) studied this question.