A short proof that O2 is an MCFL
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We present a new proof that O2 is a multiple context-free language. It contrasts with a recent proof by Salvati (2015) in its avoidance of concepts that seem specific to two-dimensional geometry, such as the complex exponential function. Our simple proof creates realistic prospects of widening the results to higher dimensions. This finding is of central importance to the relation between extreme free word order and classes of grammars used to describe the syntax of natural language.
Nederhof , M J 2016 , A short proof that O 2 is an MCFL . in 54th Annual meeting of the Association for Computational Linguistics : Proceedings of the Conference . Association for Computational Linguistics , Berlin , 54th Annual meeting of the Association for Computational Linguistics , Berlin , Germany , 7-12 August .conference
54th Annual meeting of the Association for Computational Linguistics
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