Towards Robustness in Parsing -- Fuzzifying Context-Free Language Recognition

We discuss the concept of robustness with respect to parsing or recognizing a context-free language. Our approach is based on the notions of fuzzy language, (generalized) fuzzy context-free grammar, and parser/recognizer for fuzzy languages. As concrete examples we consider a robust version of Cocke-Youger-Kasami's algorithm and a robust kind of recursive descent recognizer. Keywords and phrases: fuzzy language, fuzzy context-free grammar, fuzzy context-free $K$-grammar, grammatical error, parsing/recognition of fuzzy languages, Cocke-Youger-Kasami's algorithm, recursive descent