Advances in Differential Equations, cilt.8, sa.10, ss.1153-1192, 2003 (Scopus)
We use variational methods to study the nonexistence of positive solutions for the following nonlinear parabolic partial differential equations:{∂u/∂t = δ(um) + V (x)um in ω × (0, T), u(x, 0) = u0(x) ≥ 0 in ω, u(x, t) = 0 on ∂ω × (0, T), and {∂u/∂t = δpu + V (x)up-1 in ω × (0, T), u(x, 0) = u0(x) ≥0 in ω, u(x, t) = 0 on ∂ω × (0, T), where 0 < m < 1, 1 < p < 2, V ∈ L1 loc(ω) and ω is a bounded domain with smooth boundary in ℝN.