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Published online by Cambridge University Press: 20 November 2018
1. Introduction. A linearly ordered space S in which neighborhoods are segments is called a Souslin space if
(i) S is not separable, but
(ii) every collection of disjoint segments of S is countable.
Whether a Souslin space exists is not known; this is the problem referred to in the title and was proposed by Souslin in (2).