Incollection,

Nonstandard Cwikel type estimates

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Interpolation theory and applications, volume 445 of Contemp. Math., Amer. Math. Soc., Providence, RI, (2007)
DOI: 10.1090/conm/445/08611

Abstract

We discuss modifications and generalisations of the celebrated bound on the singular values of operators of the type a(x)b(i∇) by M. Cwikel.

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