“…Observe that at equilibrium, u is independent of time so that the equation reduces to Approximation of solutions of Eq. (1.1) has been studied extensively by various authors (see, e.g., Aoyama et al [4], Blum and Oettli [6], Censor, Gibali, Reich and Sabach [12], Censor, Gibali and Reich [9][10][11], Chidume [14], Chidume et al [15,16,18,23,25,26], Gibali, Reich and Zalas [27], Iiduka and Takahashi [29], Iiduka et al [31], Kassay, Reich and Sabach [33], Kinderlehrer and Stampacchia [34], Lions and Stampacchia [36], Liu [37], Liu and Nashed [38], Ofoedu and Malonza [43], Osilike et al [44], Reich and Sabach [48], Reich [46], Rockafellar [49], Su and Xu [51], Zegeye et al [58], Zegeye and Shahzad [57], and the references therein).…”