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Memoirs of the American Mathematical Society
1994; 103 pp; softcover
List Price: US$40
Individual Members: US$24
Institutional Members: US$32
Order Code: MEMO/109/522
Principal currents were invented to provide a noncommutative spectral theory in which there is still significant localization. These currents are often integral and are associated with a vector field and an integer-valued weight which plays the role of a multi-operator index. The study of principal currents involves scattering theory, new geometry associated with operator algebras, defect spaces associated with Wiener-Hopf and other integral operators, and the dilation theory of contraction operators. This monograph explores the metric geometry of such currents for a pair of unitary operators and certain associated contraction operators. Applications to Toeplitz, singular integral, and differential operators are included.
Operator theorists, functional analysts and possibly graduate students.
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