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Products of Unbounded Normal Operators
Product of operators Normal hyponormal subnormal operators
2012/2/29
The present paper partly constitutes an "unbounded" follow-up of a paper by I. Kaplansky dealing with bounded products of normal operators. Results on the normality of unbounded products are also incl...
Exel and Stacey crossed products, and Cuntz-Pimsner algebras
Exel crossed product Stacey crossed product Cuntz-Pimsner algebra endomorphism
2011/8/25
Abstract: There are many different crossed products by an endomorphism of a C*-algebra, and constructions by Exel and Stacey have proved particularly useful. Here we show that every Exel crossed produ...
A generalization of Marstrand's theorem for projections of cartesian products
Marstrand's theorem cartesian products Classical Analysis and ODEs
2011/8/23
Abstract: We prove the following variant of Marstrand's theorem about projections of cartesian products of sets:
Let $K_1,...,K_n$ Borel subsets of $\mathbb R^{m_1},... ,\mathbb R^{m_n}$ respectivel...
PRODUCTS AND QUOTIENTS OF (p,s)-ABSOLUTELY CONTINUOUS OPERATOR IDEALS
(p,s)-ABSOLUTELY CONTINUOUS OPERATOR IDEALS {\cal P}p, s
2010/3/17
We obtain a generalization of the ideal {\cal M}(q,p) of (q,p)-mixing operators-in the sense of Pietsch- as a consequence of the study of the quotients of (p, s)-absolutely continuous operator ideals ...