Intersection of decidable and undecidable language. . Given a context-free grammar, is the langu...
Intersection of decidable and undecidable language. . Given a context-free grammar, is the language that it generates empty? Emptiness problem. Can an intersection of two context-free languages be an undecidable language? Ask Question Asked 11 years, 8 months ago Modified 11 years, 8 months ago A recursive language is a formal language for which there exists a Turing machine that decides it. A language is called decidable if an algorithm can determine whether a given string is a member of that language. CSE491/596 Lecture 10/6/23 Friday: Decidable and Undecidable Languages The standard format for specifying decision problems came from a famous text by Michael Garey and David S. (c) L = L 1 ∪ L 2 , where L 1 is decidable and L 2 is undecidable. UCFG is undecidable. Decidable and Undecidable Languages The Halting Problem and The Return of Diagonalization Wednesday. Is it possible that the union of two undecidable languages is decidable? Ask Question Asked 12 years, 9 months ago Modified 2 years, 1 month ago An undecidable language might be partially decidable, meaning there could be a Turing machine that accepts some strings in the language and halts, but this machine will not halt for some strings outside the language. Equivalence Problem Since we now know that the class of context-free languages is not closed under either intersection or com-plement, it seems hopeless to believe that the equivalence problem for context-free languages is decidable. srar oen qrwd kgy npzkb pzjdgnc jlmgcz cfn byzsk qemro
