“…The literature on hemivariational inequalities has been significantly enlarged in the last forty years, see monographs [3,8,25,32,38], for analysis of various classes of such inequalities, see e.g. [2,9,11,13,14,15,16,18,21,20,30,43]. By our approach, we relax the assumptions on similar problems treated in the aforementioned papers and considerably improve some results by allowing the history-dependent operators to appear in the convex term and in the generalized directional derivative of a nonconvex potential.…”