Geodesic
An irreducible semigroup of idempotents
Studia Mathematica, Tome 125 (1997) no. 1, pp. 97-99 Cet article a éte moissonné depuis la source Institute of Mathematics Polish Academy of Sciences

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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.
DOI : 10.4064/sm-125-1-97-99
Keywords: invariant subspaces, idempotents, operator semigroups 
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Roman Drnovšek. An irreducible semigroup of idempotents. Studia Mathematica, Tome 125 (1997) no. 1, pp. 97-99. doi: 10.4064/sm-125-1-97-99

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