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Published online by Cambridge University Press: 22 January 2016
Let D be the unit disk {z: | z | < l} in the complex plane C with boundary ∂D and closure and denote by R the image of the canonical embedding r → r + iO of the real line into C. The symbol ε will be used throughout to denote a complex parameter; the unit disk in the complex ε-plane will be denoted by Dp.