In this paper, we study two nonlinear Sobolev-type equations on the Heisenberg groups. We show that the problems do not admit nontrivial local weak solutions, i.e. "instantaneous blow-up" occurs, using the nonlinear capacity method. Namely, by choosing suitable test functions, we will prove an instantaneous blow-up for any initial conditions $ u_0, \, u_1\in L^q(\mathbb{H}^n) $ with $ q\leq \frac{Q}{Q-2} $.
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