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单词 Fatou's Theorems
释义

Fatou's Theorems

Let 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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