2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/61615We consider two eliiptic overdetermined boundary value problems. There are variants on J. Serrin's 1971 classical results and having the same conclusion that the domains should be forcibly Euclidean balls.5 pagesAnalysis of PDEsClassical Analysis and ODEs35N05; 35N10text