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The classical Babuska-Brezzi theory for variational problems withconstraints is a very well established tool for studying the weak solutionsand Galerkin approximations, via mixed formulations, of a wideclass of linear boundary value problems in physics and engineeringsciences (see, e.g. [2], [9] and the references therein).?This research was partially supported by Fondecyt-Chile through the projectNo. 1980122 and by the Program A on Numerical Analysis of the FONDAP in...

Solvability and Galerkin Approximations of a Class of Nonlinear Operator Equations