By Lars-Erik Andersson, Anders Klarbring (auth.), R. P. Gilbert, P. D. Panagiotopoulos, P. M. Pardalos (eds.)

This choice of papers is devoted to the reminiscence of Gaetano Fichera, an excellent mathematician and likewise an outstanding good friend to the editors. unfortunately it took an strange period of time to convey this assortment out. This was once basically on the grounds that the most editor who had accumulated all the fabrics, for this quantity, P. D. Panagiotopoulos, died without warning in the course of the interval after we have been enhancing the manuscript. the opposite editors in appreciation of Panagiotopoulos' contribution to this box, think it really is consequently becoming that this assortment be devoted to his reminiscence additionally. The topic of the gathering is situated round the seminal examine of G. Fichera at the Signorini challenge. variations in this suggestion input in numerous methods. for instance, by means of bringing in friction the matter isn't any longer self-adjoint and the minimization formula isn't legitimate. a wide component to this assortment is dedicated to survey papers relating hemivariational equipment, with a major element of its program to nonsmooth mechanics. Hemivariational inequali ties, that are a generalization of variational inequalities, have been pioneered via Panagiotopoulos. there are lots of functions of this idea to the learn of non convex strength functionals happening in lots of branches of mechanics. a space of focus matters touch difficulties, particularly, quasistatic and dynamic touch issues of friction and harm. Nonsmooth optimization tools that may be divided into the most teams of subgradient equipment and package tools also are mentioned during this collection.

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Math. Anal. Appl. 233 (1999), 767-789. , AND F. SCHURICHT, Buckling of nonlinearly elastic rods in the presence of obstacles treated by nonsmooth critical point theory, Math. Ann. 311 (1998),675-728. , Nonlinear functional analysis, Springer-Verlag, Berlin-New York, 1985. , On a critical point theory for multivalued functionals and application to partial differential inclusions, Nonlinear Anal. 31 (1998), 735-753. , AND E. SCHWARTZMAN, Metric critical point theory 1. Morse regularity and homotopic stability of a minimum, J.

Condition (26) and relation (37) (applied to the function h(g) = f'(x**,g)) provide the following necessary condition for a maximum of a quasidifferentiable function On E v + 8f(x**) \/w E 8f(x**) which is equivalent to (see [3]) -flf(x**) C flf(x**). ReIllark 4. h. Glover et al [4]. ReIllark 5. Observe, in passing, that conditions (21), (24), (27) and (30) are not "constructive" since if (19), (22), (25) or (28) are not yet satisfied, then the sets L*(h) and/or L*(h) may happen to be empty, and we get no "useful" information related to the behaviour of the function under consideration and descent or ascent directions.

E. ;>c(O) such that IDe;L(x, s, ~)I :::; a(x) + b(x) (Isl~ + I~IP) , IDsL(x,s,~)I:::; 1 a(x) + b(x) (Isl~ + I~IP) . - Let f : Wo ,P(O) ---+ R be the functional defined by f(u) = In L(x, u, \1u) dx, where, as in [48], we agree that f(u) = +00 whenever In (L(x,u, \1u))+ dx = In (L(x,u, \1u))- dx = +00. From the Sobolev Theorem, it is easy to deduce that De;L(x,u, \1u) E Lloc(O) , for every u E W~'P(O), so that n -L Dz; [D e;L(x,u,\1u)] + DsL(x,u,\1u) j=l defines a distribution on O. 14. Let u E W~'P(O) with f(u) E R.