Principal Currents for a Pair of Unitary Operators (Paperback)

Introduction The geometry associated with eigenvalues The dilation space solution of the symbol Riemann Hilbert problem The principal current for the operator-tuple $\{P_1, P_2, W_1, W_2\}$ Estimates The criterion for eigenvalues The $N(\omega)$ operator The characteristic operator function of $T_1$ Localization and the ""cut-down"" property The joint essential spectrum Singular integral representations Toeplitz operators with unimodular symbols $C_{11}$-Contraction operators with $(1,1)$ deficiency indices Appendix A Appendix B Appendix C References.