On Powers of Non-Negative Matrices
Štefan Schwarz (1965)
Matematicko-fyzikálny časopis
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On Powers of Non-Negative Matrices
On idempotent binary relations on a finite set
Štefan Schwarz (1970)
Czechoslovak Mathematical Journal
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An irreducible semigroup of idempotents
Roman Drnovšek (1997)
Studia Mathematica
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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.
The Euler-Fermat theorem for the semigroup of circulant Boolean matrices
Štefan Schwarz (1980)
Czechoslovak Mathematical Journal
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The ideal structure of -semigroups
Štefan Schwarz (1977)
Czechoslovak Mathematical Journal
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