We say that a totally unimodular matrix is k-totally unimodular (k-TU), if every matrix obtained from it by setting to zero a subset of at most k entries is still totally unimodular. We present the following results. (i) A matrix is restricted unimodular if and only if it is 3-TU, (ii) for a 2-TU m
โฆ LIBER โฆ
Symmetry operations on a hierarchy of matrices
โ Scribed by Alladi Ramakrishnan
- Publisher
- Elsevier Science
- Year
- 1968
- Tongue
- English
- Weight
- 131 KB
- Volume
- 21
- Category
- Article
- ISSN
- 0022-247X
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## Abstract The methods developed for eigensolution of matrices with special patterns (__Commun. Numer. Methods Engng__ 2003; **19**: 125; 2004; **20**: 133) is extended to another canonical form defined as the __symmetry of Form IV__. Efficient methods are presented for evaluating the eigenvalues