Carrillo Menéndez, José2023-06-202023-06-2019990003-952710.1007/s002050050152https://hdl.handle.net/20.500.14352/57350We consider a class of elliptic-hyperbolic degenerate equations g(u) - Delta b(u) + div phi (u) = f with Dirichlet homogeneous boundary conditions and a class of elliptic-parabolic-hyperbolic degenerate equations g(u)(t) - Delta b(u) + div phi (u) = f with homogeneous Dirichlet conditions and initial conditions. Existence of entropy solutions for both problems is proved for nondecreasing continuous functions g and b vanishing at zero and for a continuous vectorial function phi satisfying rather general conditions. Comparison and uniqueness of entropy solutions are proved for g and b continuous and nondecreasing and for phi continuous.engjournal articlehttp://www.springerlink.com/content/ejne9t55g06xmybb/fulltext.pdfhttp://www.springerlink.comrestricted access519.7Parabolic equationsuniquenessEcuaciones diferenciales1202.07 Ecuaciones en Diferencias