Let A be a symmetric matrix of size n Γ n with entries in some (commutative) ΓΏeld K. We study the possibility of decomposing A into two blocks by conjugation by an orthogonal matrix T β Matn(K). We say that A is absolutely indecomposable if it is indecomposable over every extension of the base ΓΏeld.
On fully indecomposable matrices
β Scribed by Trevor I. Fenner; Georghios Loizou
- Book ID
- 104148043
- Publisher
- Elsevier Science
- Year
- 1971
- Tongue
- English
- Weight
- 622 KB
- Volume
- 5
- Category
- Article
- ISSN
- 0022-0000
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β¦ Synopsis
In this paper various properties of fully indecomposable matrices are investigated. Several integer-valued functions of nonnegative matrices are defined and various relations between them are obtained and, where appropriate, related to corresponding concepts in graph theory. These relations are used to obtain upper bounds on the index of primitivity of a fully indecomposable matrix. Matrix and Kronecker products of fully indecomposable matrices are considered, and lastly the connection between fully indecomposable matrices and essentially nonsingular matrices is examined.
π SIMILAR VOLUMES
Let rY n be integers, Γn `r `n, An n Γ n Boolean matrix A is called r-indecomposable if it contains no k Γ l zero submatrix with k l n Γ r 1. A is primitive if one of its powers, e k , has all positive entries for some integer k P 1. If A is primitive, then there is a smallest positive integer h r e