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Some remarks on $$\Gamma$$-convergence and least squares method. (English) Zbl 0747.49008
Composite media and homogenization theory, Proc. Int. Cent. Theor. Phys. Workshop, Trieste/Italy 1990, Prog. Nonlinear Differ. Equ. Appl. 5, 135-142 (1991).
[For the entire collection see Zbl 0722.00038.]
Ideas and conjectures are given on how to use the methods of $$\Gamma$$- convergence of functionals in the study of differential equations (Originally, the theory of $$\Gamma$$-convergence was especially developed by the author and others to handle problems related to optimization and similar topics). Reformulating the given differential equations by least squares terms with some parameter investigations of their weak solutions can be taken by using $$\Gamma$$-limits of such terms with respect to the parameter considering weak topologies. In a few illustrative examples the main ideas and conjectures are explained.
The author’s intention of giving new stimulations to specialists for further researches in this field of weak solutions for differential equations can be regarded as very successful.

##### MSC:
 49J20 Existence theories for optimal control problems involving partial differential equations 35D99 Generalized solutions to partial differential equations 35A15 Variational methods applied to PDEs 54A20 Convergence in general topology (sequences, filters, limits, convergence spaces, nets, etc.) 49J45 Methods involving semicontinuity and convergence; relaxation
##### Keywords:
variational limits; $$\Gamma$$-convergence; weak topologies