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Bifurcation results on positive solutions of an indefinite nonlinear elliptic system. (English) Zbl 06146691

MSC:
35B05 Oscillation, zeros of solutions, mean value theorems, etc. in context of PDEs
35J61 Semilinear elliptic equations
58C40 Spectral theory; eigenvalue problems on manifolds
35J15 Second-order elliptic equations
58E07 Variational problems in abstract bifurcation theory in infinite-dimensional spaces
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