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Comment on Similarity analysis in magnetohydrodynamics:effects of Hall andion-slip currents on free convection flow and mass transfer of a gas past asemi-infinite vertical plate, A.A. Megahed, S.R. Komy, A.A. Afify [ActaMechanica 151, 185-194 (2001)]  In the above paper is investigated the boundary layer flow of an electricallyconducting fluid over a vertical, stationary plate placed in a calm fluid. Theeffects of Hall and ion-slip currents are taken into account. The boundarylayer equations are transformed into ordinary ones using a scaling group oftransformations and subsequently are solved numerically. However, there are twofundamental errors in the above paper which are presented below.

Comment on "Similarity analysis in magnetohydrodynamics: effects of Hall  and ion-slip currents on free convection flow and mass transfer of a gas past  a semi-infinite vertical plate," A.A. Megahed, S.R. Komy, A.A. Afify