Weighted Shifts on Directed Trees - Memoirs of the American Mathematical Society (Paperback)
  • Weighted Shifts on Directed Trees - Memoirs of the American Mathematical Society (Paperback)
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Weighted Shifts on Directed Trees - Memoirs of the American Mathematical Society (Paperback)

(author), (author), (author)
£68.95
Paperback 107 Pages / Published: 30/03/2012
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A new class of (not necessarily bounded) operators related to (mainly infinite) directed trees is introduced and investigated. Operators in question are to be considered as a generalization of classical weighted shifts, on the one hand, and of weighted adjacency operators, on the other; they are called weighted shifts on directed trees. The basic properties of such operators, including closedness, adjoints, polar decomposition and moduli are studied. Circularity and the Fredholmness of weighted shifts on directed trees are discussed. The relationships between domains of a weighted shift on a directed tree and its adjoint are described. Hyponormality, cohyponormality, subnormality and complete hyperexpansivity of such operators are entirely characterized in terms of their weights. Related questions that arose during the study of the topic are solved as well.

Publisher: American Mathematical Society
ISBN: 9780821868683
Number of pages: 107
Weight: 398 g
Dimensions: 254 x 178 mm

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