Gabor Szeg : Collected Papers, 1945-1972 (Contemporary Mathematicians)

this series is assumed to be convergent in a certain circular ring rl < I z I < r2, rl < 1 < r2. 1) is in this case a Hermitian one and the associated Laurent series i8 represents a real function f(8) on the unit circle z = e , -'II" ~ 8 < '11".