zbMATH — the first resource for mathematics

Examples
Geometry Search for the term Geometry in any field. Queries are case-independent.
Funct* Wildcard queries are specified by * (e.g. functions, functorial, etc.). Otherwise the search is exact.
"Topological group" Phrases (multi-words) should be set in "straight quotation marks".
au: Bourbaki & ti: Algebra Search for author and title. The and-operator & is default and can be omitted.
Chebyshev | Tschebyscheff The or-operator | allows to search for Chebyshev or Tschebyscheff.
"Quasi* map*" py: 1989 The resulting documents have publication year 1989.
so: Eur* J* Mat* Soc* cc: 14 Search for publications in a particular source with a Mathematics Subject Classification code (cc) in 14.
"Partial diff* eq*" ! elliptic The not-operator ! eliminates all results containing the word elliptic.
dt: b & au: Hilbert The document type is set to books; alternatively: j for journal articles, a for book articles.
py: 2000-2015 cc: (94A | 11T) Number ranges are accepted. Terms can be grouped within (parentheses).
la: chinese Find documents in a given language. ISO 639-1 language codes can also be used.

Operators
a & b logic and
a | b logic or
!ab logic not
abc* right wildcard
"ab c" phrase
(ab c) parentheses
Fields
any anywhere an internal document identifier
au author, editor ai internal author identifier
ti title la language
so source ab review, abstract
py publication year rv reviewer
cc MSC code ut uncontrolled term
dt document type (j: journal article; b: book; a: book article)
Existence and uniqueness of splittings for stationary iterative methods with applications to alternating methods. (English) Zbl 0905.65048

Collecting the various results in the literature on which kinds of splitting of a matrix of a system of linear equations are connected with certain iteration matrices, the authors derive a necessary and sufficient condition for the existence of a splitting and a non-uniqueness result in the singular case. They then consider alternating iterations with different splittings. The previously established results are used to deduce results on the existence of splittings for the combined iteration and the combined convergence properties.

Particular attention is paid to monotone and positive (semi)definite matrices. A final comparison result shows that under certain conditions the combined iteration converges at least as fast as each single iteration.


MSC:
65F10Iterative methods for linear systems
15A06Linear equations (linear algebra)