  Subramanian, Pujari and Becker (2004) claim that the correct expression for
the angular momentum transport in an accretion disc, which is proportional to
dOmega/dR, can be derived on the basis of the analysis of the epicyclic motion
of gas parcels in adjacent eddies in the disc. We study their argument and show
that their derivation contains several fundamental errors: 1) the biased choice
of the desired formula from an infinite number of formulae; 2) the biased
choice of parcel trajectories; and 3) confusion regarding the reference frames.
Following 1) we could derive, for example, a (invalid) formula in which the
angular momentum transport is proportional to dv_phi/dR, and from 2) we could
even prove that the angular momentum transport is either inward or null. We
present the correct approach to the problem of angular momentum transport in an
accretion disc in terms of mean free path theory.
