Abstract

this article concerns autosegmental representations, and not the rules which are presumed to manipulate them. Due to the expository goals of this paper we have not attempted to carry out a detailed analysis of a large body of phonological data, however we acknowledge that this is an important task and it is one that we intend to undertake in future work. Deriving the No-Crossing Constraint Sagey defines three relations on temporal units: simultaneity, precedence and overlap. Certain facts about the first two relations (and presumably the third also) are taken to be `included in our knowledge of the world' (p.110). We begin with a brief review of these facts. Temporal overlap is a two-place relation which is reflexive, symmetric and nontransitive. If we employ the notation x ffi y for the statement `x overlaps y' then these facts about overlap can be stated as follows: (1) a. For any x, x ffi x overlap is reflexive

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