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Displaying similar documents to “Randomly Weighted Series of Contractions in Hilbert Spaces.”

q-deformed circularity for an unbounded operator in Hilbert space

Schôichi Ôta (2010)

Colloquium Mathematicae

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The notion of strong circularity for an unbounded operator is introduced and studied. Moreover, q-deformed circularity as a q-analogue of circularity is characterized in terms of the partially isometric and the positive parts of the polar decomposition.