“…Considerable progress has been achieved in their modeling, mathematical analysis and numerical simulations, and, as a result, a general Mathematical Theory of Contact Mechanics is currently emerging. It is concerned with the mathematical structures which underly general contact problems with different constitutive laws, i.e., materials, various geometries and different contact conditions, see for instance [7,8,14,16,17,19] and the references therein. An important number of contact problems arising in Mechanics, Physics and Engineering Science lead to mathematical models expressed in terms of subdifferential inclusions, and variational and hemivariational inequalities.…”