ABSTRACT
Let G(z) be a Stieltjes transform () G ( z ) = ∫ 0 ∞ υ ( t ) z + t d t , z ∈ S π : = [ z ∈ ℂ : | arg z | < π ] , https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781003072126/15070696-a94f-4da5-a117-8ee069a896b3/content/eq2887.tif"/>