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Published online by Cambridge University Press: 22 January 2016
1. Let be an abstract Riemann surface in the sense of Weyl-Radó, and
an open covering surface over
. If a curve C = {P(t);0≦t<1} on
tends to the ideal boundary of
but its projection terminates at an inner point of
as t→1, we shall say that C determines an accessible boundary point (which will be abbreviated by A.B.P.) of
relatively to
. The set of all the A.B.P.S of
relative to
will be called accessible boundary (relative to
) and denoted by 3i(
) or by
(
,
). Throughout in this paper
(
) will be supposed to be non-empty.