释义 |
Fatou's TheoremsLet be Lebesgue Integrable and let
 | (1) |
be the corresponding Poisson Integral. Then Almost Everywhere in 
 | (2) |
Let
 | (3) |
be regular for , and let the integral
 | (4) |
be bounded for . This condition is equivalent to the convergence of
 | (5) |
Then almost everywhere in ,
 | (6) |
Furthermore, is measurable, is Lebesgue Integrable, and the FourierSeries of is given by writing . References
Szegö, G. Orthogonal Polynomials, 4th ed. Providence, RI: Amer. Math. Soc., p. 274, 1975.
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