Lagrange multipliers for functions derivable along directions in a linear subspace

Authors: Lê Hải An, Phạm Xuân Dụ, Dương Minh Đức, Phan Van Tuoc, Lê Hải An,

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Publisher, magazine: ,

Publication year: 2005

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Abstract

The authors prove a Lagrange multipliers theorem for a class of functions that are derivable along directions in a linear subspace of a Banach space. The result generalizes the classical result on Lagrange multipliers. Next a generalization of the Lax-Milgram theorem is given as well as some applications to variational inequalities and quasilinear elliptic equations.

Tags: Lagrange multipliers; Lax-Milgram theorem; variational inequalities; quasilinear elliptic eigenvalue problem