Download or read book Context-free Languages And Primitive Words written by Masami Ito and published by World Scientific. This book was released on 2014-09-25 with total page 519 pages. Available in PDF, EPUB and Kindle. Book excerpt: A word is said to be primitive if it cannot be represented as any power of another word. It is a well-known conjecture that the set of all primitive words Q over a non-trivial alphabet is not context-free: this conjecture is still open. In this book, the authors deal with properties of primitive words over a non-primitive alphabet, the language consisting of all primitive words and related languages. Moreover, some decidable and undecidable problems with respect to the above languages are discussed as well. As another try, a search for a non-phrase structure grammar which generates Q is performed.