The work is devoted to the calculation of asymptotic value of the choice number of the complete r-partite graph K m \* r = K m,. ..,m with equal part size m. We obtained the asymptotics in the case ln r = o(ln m). The proof generalizes the classical result of A.L. Rubin for the case r = 2.
A generalization of Brauer's theorem on splitting fields to semigroups
β Scribed by Janez Bernik
- Publisher
- Elsevier Science
- Year
- 2003
- Tongue
- English
- Weight
- 84 KB
- Volume
- 266
- Category
- Article
- ISSN
- 0021-8693
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β¦ Synopsis
Let F be either an algebraic number field or a p-adic field and A a central simple algebra over F . Suppose A is spanned by a multiplicative semigroup Ξ β A with the property that the minimal polynomial of every g β Ξ splits over F . Then A represents the trivial class in the Brauer group of F .
π SIMILAR VOLUMES
We construct two classes of 3 Γ 3 and 4 Γ 4 real symmetric matrices, and establish sufficient conditions for the spectrum of a matrix A in each class to be disjoint from its kth order Gershgorin region. This provides a partial answer to a question raised by Newman and Thompson. The problem of provid