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1.2 Existence Theorems
Theorem 1.1 If f(z)=u(x,y)+iv(x,y) is analytic in D,then f*(z)=[u(x,y)+φ(y)]+i[v(x,y)+ψ(x)]is semi-analytic of the first kind in D,where φ(y) and ψ(x) are arbitrary continuous functions in D.
Theorem 1.2 If f(z)=u(x,y)+iv(x,y) is analytic in D,then f*(z)=[u(x,y)+ψ(x)]+i[v(x,y)+φ(y)]is semi-analytic of the second kind in D,where
φ(y) and ψ(x) are arbitrary continuous functions in D.