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Published online by Cambridge University Press: 20 November 2018
Let Dn be the open unit ball in En, and let Sn be the n-sphere. The cluster set C(f, p) of a function f : Dn —> Sn at a point p on the boundary of Dn is the set of points y in Sn such that there exists a sequence of points xm —> p, xm in Dn, with f(xm) —> y. Given an arc γ in , meeting the boundary bdy(Dn) only in p, the arc cluster set C(f, γ) is the set of points y in Sn such that there exists a sequence xm —> p, xm in γ, with f(xm) —> y.