“…Semilinear variational inequalities are widely studied in the literature (see, for instance, [1][2][3][4][5][6][7][8][9][10][11][12][13] and references therein) via different methods and techniques, like variational and topological methods, sub-solution and super-solution methods, fixed point theorem methods, penalization techniques, methods using a priori estimates on the solutions, and approximation and regularization argument methods.…”