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Published online by Cambridge University Press: 22 April 2026
The thesis of this paper is that a ‘mirror image’ convention should be incorporated into linguistic metatheory. This convention may be interpreted as a notational device; it serves to collapse rules that are significantly similar in that they are mirror images of one another, in a sense that can be made fairly precise. Part I gives a preliminary formulation of the convention and discusses syntactic evidence; Part II, to be published in Lg. 45:4, will deal with lexical and phonological evidence.