We prove results concerning the existence of solutions for the problem $-\mathrm{a}(\mathrm{x},{\int }_{\mathrm{\Omega }} \ \mathrm{u} \ \mathrm{d}\mathrm{x})\mathrm ...
This is a preview. Log in through your library . Abstract In the paper a second order differential system with a periodic boundary data is considered. Using some variational methods sufficient ...
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