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Subject Index > W - Pg. 516

516 positive semidefinite sequence, 27 power moments of a positive measure µ on R, 138 power moments of a positive operator- valued measure, 142 primal, 47 probability measure, 237 proper interval graph, 125 quadrature, 55 quarterplane causal, 239 quasicontinuous, 331 quasimultiplicative, 253 quasitriangular, 310 rank k numerical range of T , 168 rectangle, 385 rectangular, 385 recursive digital filters, 67 reduced form, 214 Riesz brothers theorem, 346 Riesz-Haviland criterion, 254 right diagonal factor, 73 right invariant mean, 211 right stable factor, 203 right stable factorization, 203 right triangular G-factorization, 80 Schur complement of T supported on M, 98 Schur parameters, 118 Schur's algorithm, 353 Schur-Agler class, 302 Schur-Cohn test, 162 selfdual, 2 semidefinite programming (SDP), 47 semispectral measure, 84 simplicial, 9 small Hankel operator, 286 sparsity pattern, 7 spectral distribution measure, 238 spectral factorization, 67 spectral radius, 347 squared magnitude response, 67 stable, 202 stable matrix, 151 stable operator-valued polynomial, 90 stable polynomial, xii state, 211 state space, 442 SUBJECT INDEX stationary in the wide sense, 156 stationary process, 238 Stein equation, 150 strict contraction, 257 strictly feasible for the dual problem, 47 strictly feasible for the primal prob- lem, 47 strong Parrott problem, 353 subgraph induced, 7 subpattern of J, 374 superoptimal completion, 322 superoptimal singular values, 338 Sylvester's law of inertia, 362 symmetric, 211 symmetric pattern, 7, 383 symmetric rectangular, 385 Szeg 's theorem, 97 o Toeplitz matrix, 5 Toeplitz operator with symbol F , 109 Toeplitz-type Corona-problems, 357 tree, 217 triangular, 378 triangular negative/positive inertia, 390 triangular subpattern, 379 trigonometric polynomial, 3 truncated K-moment problem, 254 truncated Hamburger moment prob- lem, 140 truncated trigonometric moment prob- lem, 19 undirected graph, 7 unilateral shift operator, 275 unitarily reducible, 435 Vandermonde matrix, 419 vertex separator, 9 vertex set, 7 Von Neumann inequality, 306 weakly measurable, 84 Wiener class, 94 word, 178