Table of contents : Preliminaries....Pages 1-7 Gross-Sobolev derivative, divergence and Ornstein-Uhlenbeck operator....Pages 9-18 Meyer inequalities....Pages 19-25 Hypercontractivity....Pages 27-30 L p -multipliers theorem, meyer inequalities and distributions....Pages 31-39 Some applications of the distributions....Pages 41-51 Positive distributions and applications....Pages 53-60 Characterization of independence of some Wiener functionals....Pages 61-67 Moment inequalities for Wiener functional....Pages 69-79 Introduction to the theorem of Ramer....Pages 81-90