On the Spectra of Toeplitz's Matrices
Philip E. Hartman, Aurel Wintner · American Journal of Mathematics · 1950
(2) t~~~~~~~ (0) Y , fn e*. n=-co Let f (f-, f+), where f+ and f- are the respective sequences f+ = (fo, f,** f- = * , f-2., f4)., and let the corresponding functions f+ ((p) i f- (p) of class L2 be called the interior and exterior functions of f (Q), 00 oo