Abstract
We derive sufficient conditions for the nonexistence of global weak solutions to the nonlinear pseudo-parabolic equation ut - Hut - Hu = |u| p +f(t,.),(t,.).(0,8)xH,where is the Kohn-Laplace operator on the -dimensional Heisenberg group , and is a given function. Next, we extend this result to the case of systems. Our technique of proof is based on the test function method.