期刊名称:Conference on European Chapter of the Association for Computational Linguistics (EACL)
出版年度:2012
卷号:2012
出版社:ACL Anthology
摘要:The language MIX consists of all strings over
the three-letter alphabet {a, b, c} that contain
an equal number of occurrences of each letter.
We prove Joshi¡¯s (1985) conjecture that MIX
is not a tree-adjoining language.