1. I> Let ? : ? D ? R be piecewise continuous. Show that for any a, ß ? R, r 2 p 0 ? ( e i? ) d?

1.    I> Let ϕ : D R be piecewise continuous. Show that for any α, β R,


r 2π 0


ϕ(e) = r


α+2π

 

α


2π

r

 

ϕ(e) =

0


ϕ(ei(βθ)) .


The first equality is used several times in this section.

 

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