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Weak and strong solvability of parabolic variational inequalities in Banach spaces
Authors:Matthew?Rudd  author-information"  >  author-information__contact u-icon-before"  >  mailto:rudd@math.utexas.edn,rudd@math.utexas.edu"   title="  rudd@math.utexas.edn,rudd@math.utexas.edu"   itemprop="  email"   data-track="  click"   data-track-action="  Email author"   data-track-label="  "  >Email author
Affiliation:(1) Department of Mathematics, University of Utah, 155 South 1400 East, Salt Lake City, UT 84112-0090, USA;(2) Present address: Department of Mathematics, University of Texas at Austin, Austin, TX, 78712
Abstract:We consider parabolic variational inequalities having the strong formulation
$$
left{ {begin{array}{*{20}c}
  {leftlangle {u'(t),,v - left. {u(t)} rightrangle + leftlangle {Au(t),} right.,v - left. {u(t)} rightrangle + Phi (v) - Phi (u(t) geq 0,} right.} 
  {forall v in V^{**} ,,a.e.,t geq 0,} 
 end{array} } right.
$$((1))
where$$u(0) = u_0 $$ for some admissible initial datum, V is a separable Banach space with separable dual$$V^* ,A:V^{**} to V^* $$ is an appropriate monotone operator, and$$Phi :V^{**} to mathbb{R} cup { infty } $$ is a convex,$${text{weak}}^* $$ lower semicontinuous functional. Well-posedness of (1) follows from an explicit construction of the related semigroup$${ S(t):t geq 0} .$$ Illustrative applications to free boundary problems and to parabolic problems in Orlicz-Sobolev spaces are given.
Keywords:  KeywordHeading"  >Mathematics Subject Classification (2000). 35  47D  49
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