A Note on Block Idempotents
نویسندگان
چکیده
منابع مشابه
A Note on Idempotents in Finite Aw*-factors
We prove that the value of the quasi-trace on an idempotent element in a AW*-factor of type II1 is the same as the dimension of its left (or right) support. It is a long standing open problem (due to Kaplansky) to prove that an AW*factor of type II1 is in fact a von Neumann algebra. A remarkable answer, in the affirmative, was found by Haagerup ([Ha]), who proved that if an AW*-factor A is gene...
متن کاملBlock Idempotents of Twisted Group Algebras1
In [4] Conlon has successfully generalized much of the theory of modular representations to the projective case. However his generalization [4, p. 166] of one of Brauer's main theorems on blocks [3, 10B], [5] is not entirely satisfactory. In Theorem 1 we present another generalization which is closer than Conlon's to the original Brauer theorem, and in Theorem 2 we indicate an application invol...
متن کاملA Note on the Block Cipher Camellia
Camellia is a block cipher jointly developed by NTT and Mitsubishi in 2000. In this note, we describe some observations on the design of the cipher.
متن کاملA Note on the Block Sum Transformation
In a recent paper, Bourchard et al. [1] proposed the block sum transformation, a method intended as an alternative to the discrete Fourier transform (DFT), with application to the analysis of excited vibrations of linear systems. In this note, we mention the existence of a number of alternative algorithms for the computation of the DFT, and show that the block sum transformation is equivalent t...
متن کاملOn concentrating idempotents, a survey
A sum of exponentials of the form f(x) = exp (2 iN1x)+exp (2 iN2x)+ +exp (2 iNmx), where the Nk are distinct integers is called an idempotent trigonometric polynomial or, simply, an idempotent. It is known that for every p > 1; and every set S of the torus T = R=Z with jSj > 0; there are idempotents concentrated on S in the Lp sense. We sketch how this concentration phenomenon originated as a r...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Algebra
سال: 1993
ISSN: 0021-8693
DOI: 10.1006/jabr.1993.1073