# Efficient Normal-Form Parsing for Combinatory Categorial Grammar

@article{Eisner1996EfficientNP, title={Efficient Normal-Form Parsing for Combinatory Categorial Grammar}, author={Jason Eisner}, journal={ArXiv}, year={1996}, volume={cmp-lg/9605038} }

Under categorial grammars that have powerful rules like composition, a simple n-word sentence can have exponentially many parses. Generating all parses is inefficient and obscures whatever true semantic ambiguities are in the input. This paper addresses the problem for a fairly general form of Combinatory Categorial Grammar, by means of an efficient, correct, and easy to implement normal-form parsing technique. The parser is proved to find exactly one parse in each semantic equivalence class of…

## 114 Citations

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An algorithm which translates the Penn Treebank into a corpus of Combinatory Categorial Grammar (CCG) derivations is presented and it is demonstrated how the combination of preprocessing and type-changing rules minimizes the lexical coverage problem.

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