%0 Journal Article %A Díaz Díaz, Jesús Ildefonso %A Kersner, R. %T Nonexistence of one of the free boundaries in a degenerate equation in filtration theory %D 1983 %@ 0764-4442 %U https://hdl.handle.net/20.500.14352/64674 %X We study the qualitative behaviour of solutions of the equation ut−(um)xx+b⋅(uλ)x=0 when it models some evaporation phenomena, λ<1≤m. We show strong differences with respect to the porous media equation; there is no right free boundary. We also study the behaviour of the left free boundary %~