  Recently, consistency of the infinite square well solution of the space
fractional Schr\"odinger equation has been the subject of some controversy. In
[J. Math. Phys. 54, 014101 (2013)], Hawkins and Schwarz objected to the way
certain integrals are evaluated to show the consistency of the infinite square
well solutions of the space fractional Schr\"odinger equation [J. Math. Phys.
53, 042105 (2012); J. Math. Phys. 53, 084101 (2012)]. Here, we show for general
n that as far as the integral representation of the solution in the momentum
space is concerned, there is no inconsistency. To pinpoint the source of a
possible inconsistency, we also scrutinize the different representations of the
Riesz derivative that plays a central role in this controversy and show that
they all have the same Fourier transform, when evaluated with consistent
assumptions. PACS numbers: 03.65.Ca, 02.50.Ey, 02.30.Gp, 03.65.Db
