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A boundedness result for twisted convolution

✍ Scribed by Alexey Karapetyants; Enrique Ramírez de Arellano


Publisher
John Wiley and Sons
Year
2003
Tongue
English
Weight
210 KB
Volume
250
Category
Article
ISSN
0025-584X

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✦ Synopsis


Abstract

We consider twisted convolution operators with kernels having singularities on a sphere and having as Fourier transform the oscillatory symbol m~α~(|ξ|) = |ξ|^–α^e^i|ξ|^, 0 ≤ ℜ︁__α__ < 2__n__. We give integral representations for such operators and, as a principal result, we study L~p~–L~q~ estimates for them.


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A boundedness result for toric log Del P
✍ Dimitrios I. Dais; Benjamin Nill 📂 Article 📅 2008 🏛 Springer 🌐 English ⚖ 186 KB

In this paper we give an upper bound for the Picard number of the rational surfaces which resolve minimally the singularities of toric log Del Pezzo surfaces of given index &#8467;. This upper bound turns out to be a quadratic polynomial in the variable &#8467;.