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We consider a parametric nonlinear elliptic problem driven by the sum of a  p -Laplacian and of a  q -Laplacian (a-equation) with a singular and-superlinear reaction and a Robin boundary condition with-sublinear boundary term. So, the problem has the combined effects of singular, concave and convex terms. We look for positive solutions and prove a bifurcation-type theorem describing the changes in the set of positive solutions as the parameter varies.

Singular ( p , q )-equations with superlinear reaction and concave boundary condition