Publication: An extension of a theorem of Domar on invariant subspaces
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Publication Date
2017
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Univ. Szeged, Bolyai Institute, Aradi Vertanuk Tere
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Abstract
A remarkable theorem of Domar asserts that the lattice of the invariant subspaces of the right shift semigroup {S-tau}(tau >= 0) in L-2 (R+, w(t)dt) consists of just the " standard invariant subspaces" whenever w is a positive continuous function in R+ such that