Before revision: We reconsider a linear finite element method on a Bakhvalov-type mesh for a singularly perturbed problem with two parameters , which has been discussed in Brdar and Zarin (J. Comput. Appl. Math., 292 (2016), pp. 307--319). A novel interpolant is introduced for convergence analysis.
After revision: We reconsider a linear finite element method on a Bakhvalov-type mesh for a singularly perturbed problem with two parameters . The solution of the problem exists two exponential boundary layers. A new interpolation, which is simple in construction and analysis, is introduced for convergence analysis.