Sturdy bands of semigroups.
Miroslav Ciric, Stojan Bogdanovic (1990)
Collectanea Mathematica
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In this paper we consider band compositions determined by two transitive systems of monomorphisms, called the sturdy bands of semigroups.
Miroslav Ciric, Stojan Bogdanovic (1990)
Collectanea Mathematica
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In this paper we consider band compositions determined by two transitive systems of monomorphisms, called the sturdy bands of semigroups.
Roman Drnovšek (1997)
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We construct a semigroup of bounded idempotents with no nontrivial invariant closed subspace. This answers a question which was open for some time.
B.M. Schein (1972)
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H. Radjavi, M. Radjabalipour, P. Fillmore, G. MacDonald (1994)
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J. Koliha (2000)
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We give new necessary and sufficient conditions for an element of a C*-algebra to commute with its Moore-Penrose inverse. We then study conditions which ensure that this property is preserved under multiplication. As a special case of our results we recover a recent theorem of Hartwig and Katz on EP matrices.
D. Easdown (1984)
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T.E. Hall (1971)
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P. Olin (1986-1987)
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J.E. Mills (1978)
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C. Fennemore (1971)
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