نبذة مختصرة : We prove the blow-up of solutions of the semilinear damped Klein-Gordon equation in a finite time for arbitrary positive initial energy on the Heisenberg group. This work complements the paper Ruzhansky and Tokmagambetov (J Differ Equ 265(10):5212-5236, 2018), where the global in time well-posedness was proved for the small energy solutions.
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