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Published online by Cambridge University Press: 20 November 2018
Let R m denote a m dimensional Euclidean space. When x ∊ R m will write x = (x 1, x 2,..., x m ). Let R + m ={x: x ∊ R m , x i < 0 for all i} and R - m ={x: x ∊ R m , x i < 0 for all i}. In this paper we consider a class of functions which consists of mappings, E r (K) and H r (K) of R m into R which are indexed by K ∊ R + m and K ∊ R - m respectively, and defined at any point α ∊ R m by
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