Comment on "Transformation of phase velocity among inertial frames [Wave Motion 50 (2013) 520-524, https://doi.org/10.1063/1.1888051]"
The transformation formulas between two inertial frames for the minimum phase velocity and the phase velocity in an arbitrary direction are given. The derived transformation formula for the reciprocal of the phase velocity along the particle's direction of motion is a correction of the formula provided by J.J. Zhang and P.X. Wang in Wave Motion 50 (2013) 520-524.
physics.class-ph↗