A note on the boundary layer equations with linear slip boundary condition

In a recent article the authors study the effect of replacing the standard no-slip boundary condition with a nonlinear Navier boundary condition for the boundary layer equations. The resulting equations contain an arbitrary index parameter, denoted by n, and it is found that the case n = 1 corresponding to linear Navier boundary condition must be excluded. In this article the authors remedy this situation and show that the case n = 1 corresponds to a particular similarity solution, not included in the previous work by the authors. c © 2007 Elsevier Ltd. All rights reserved.