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Set-valued pseudomonotone maps and degenerate evolution inclusions. (English) Zbl 0959.34049
The authors prove existence and uniqueness of a weak solution to the problem $(Bu)'+Au\ni f,\;u(0)=u_0,$ in a Banach space and then apply the theory to a frictional contact problem. $$B$$ is assumed to be linear and is allowed to vanish. $$A$$ is assumed to be a pseudomonotone set-valued operator. The proof of this theorem is based on the method of elliptic regularization from J. L. Lions [Quelques methods de resolution des problèmes aux limites nonlinéaires, Dunod, Paris (1969; Zbl 0189.40603)] adapted to the set-valued case. Notation, terminology and other preliminaries are given in section 2, while section 3 contains a number of technical lemmas needed for the proof of the main results, stated in theorems 4.3, 4.4 and 4.5. Sections 5-8 give a detailed explanation of the application, a problem of frictional contact between a deformable body and a moving rigid foundation. Theorems 4.4 and 4.5 are applied to the problem to obtain existence and uniqueness of a solution. The authors cite references for earlier work on this evolution inclusion and also information on pseudomonotone maps, plus give a number of references concerning related friction problems.

##### MSC:
 34G25 Evolution inclusions 47H05 Monotone operators and generalizations 47H04 Set-valued operators 47N20 Applications of operator theory to differential and integral equations 49J40 Variational inequalities 74M15 Contact in solid mechanics 74M10 Friction in solid mechanics
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##### References:
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