We consider the (1, 2)-Sobolev space W-1,W-2(U) on subsets U in an abstract Wiener space, which is regarded as a canonical Dirichlet space on U. We prove that W-1,W-2 (U) has smooth cylindrical functions as a dense subset if U is H-convex and H-open. For the proof, the relations between H-notions and quasi-notions are also studied. (C) 2011 Elsevier Masson SAS. All rights reserved.
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Lomonosov Moscow State Univ, Moscow 119991, Russia
Moscow Ctr Fundamental & Appl Math, Moscow 119991, RussiaLomonosov Moscow State Univ, Moscow 119991, Russia
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Univ Milano Bicocca, Dipartimento Matemat & Applicaz, Via Cozzi 55, I-20126 Milan, ItalyUniv Milano Bicocca, Dipartimento Matemat & Applicaz, Via Cozzi 55, I-20126 Milan, Italy
Addona, Davide
Cappa, Gianluca
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Univ LUISS Guido Carli, Dipartimento Econ & Finanza, Viale Romania 32, I-00197 Rome, ItalyUniv Milano Bicocca, Dipartimento Matemat & Applicaz, Via Cozzi 55, I-20126 Milan, Italy
Cappa, Gianluca
Ferrari, Simone
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Univ Parma, Dipartimento Sci Matemat Fis & Informat, Parco Area Sci 53-A Campus, I-43124 Parma, ItalyUniv Milano Bicocca, Dipartimento Matemat & Applicaz, Via Cozzi 55, I-20126 Milan, Italy