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The inertial-interval energy spectrum of strong magnetohydrodynamic (MHD)turbulence with a uniform background magnetic field was observed numerically tobe close to $k^{-3/2}$ by a number of independent groups. A dissenting opinionhas been voiced by Beresnyak, A. 2011, PRL, 106, 075001-. 2012, MNRAS, 422,3495-. 2014, ApJ, 784, L20 that the spectral scaling is close to $k^{-5/3}$.The conclusions of these papers are however incorrect as they are based onnumerical simulations that are drastically unresolved, so that the discretenumerical scheme does not approximate the physical solution at the scales wherethe measurements are performed. These results have been rebutted in our moredetailed papers Perez, J. C., Mason, J., Boldyrev, S., & Cattaneo, F. 2012,PRX, 2, 041005-. 2014, ApJL, 793, L13; here, by popular demand, we present abrief and simple explanation of our major criticism of Beresnyak's work.

Comment on the numerical measurements of the magnetohydrodynamic  turbulence spectrum by A. Beresnyak (Phys. Rev. Lett. 106 (2011) 075001;  MNRAS 422 (2012) 3495; ApJ 784 (2014) L20)