  The purpose of this note is to remove the confusion about counting of
resonant wave triads for Rossby and drift waves in the context of the
Charney-Hasegawa-Mima equation. In particular, we aim to point out a major
error of over-counting of triads in the paper "Discrete exact and
quasi-resonances of Rossby/drift waves on beta-plane with periodic boundary
conditions", by Kartashov and Kartashova, arXiv:1307.8272v1 [physics.flu-dyn]
(2013).
