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The Sard Inequality on Wiener Space

✍ Scribed by A.S. Üstünel; M. Zakai


Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
355 KB
Volume
149
Category
Article
ISSN
0022-1236

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✦ Synopsis


Let T(w)=w+u(w) be a Cameron Martin perturbation of the identity. The formal infinite dimensional extension of the Sard inequality,

is shown to hold and applications to absolute continuity on Wiener space are presented.

1997 Academic Press

I. INTRODUCTION

The Sard lemma on

then the Lebesgue measure of E 0 is zero. This result is useful in many applications as it often avoids the need to consider what happens on E 0 . In [9], J. T. Schwartz presented a generalization of this result: Theorem 1.1 [9]. Let D and T be as above and let J(x) denote the Jacobian determinant of T at x; also, let E be a measurable subset of D, then T(E) is measurable and


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