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The non-existence of global solutions for semirelativistic equations withnon-gauge invariant power type nonlinearity with mass is studied in the framework of weighted $L^1$. In particular, a priori control of weighted integral ofsolutions is obtained by introducing a pointwise estimate of fractionalderivative of some weight functions. Especially, small data blowup with smallmass is obtained.

Remark on the global non-existence of semirelativistic equations with non-gauge invariant power type nonlinearity with mass