PPT-Decidable languages

Sipser 41 pages 165173 Hierarchy of languages All languages Turingrecognizable Turingdecidable Contextfree languages Regular languages 0 n 1 n a n b n c n D 0 1 Describing Turing machine input. brPage 2br RecursiveandRecursivelyEnumerable Alanguageis recursivelyenumerable reif itisthesetofstringsacceptedbysomeTM Alanguageis recursive ifitisthesetofstrings acceptedbysomeTMthathaltson every input Forexampleanyregularlanguageisrecursive Wewil Class 22: . Introducing Complexity. Spring 2010. University of Virginia. David Evans. Exam 2: due now. Read Chapter 7. (we skip Ch 6). Classes 1-13. s. All Languages. Regular Languages. a. Finite Languages. Lecture14: Recap. Prof. Amos Israeli. Regular languages – Finite automata.. Context free languages – Stack automata.. Decidable languages – Turing machines.. Undecidability.. Reductions.. Subjects. Theory of Computation. Alexander . Tsiatas. Spring 2012. Theory of Computation Lecture Slides by Alexander . Tsiatas. is licensed under a Creative Commons Attribution-. NonCommercial. -. ShareAlike. “Language Death” by David Crystal. Chapter 1: What is language death?. Chapter 5: What can be done?. Language Death . Number of languages. How to count. Names of Languages. Own name, others names. JUSTUS C ROUX. IMS STUTTGART. 13.07.2015. OUTLINE. Concept Resource scarce languages. Overview of the language situation in South Africa. Lack of language resources and high level support for development of resources. C#, Java, Ruby and the Rise of . DSLs. by Daniel . Leuck. What are Some of the Trends in Computer Languages?. Many things that used to handled with libraries are now being handled at the language level.. Germanic, Romance, & Slavic Language Families. Bonjour!. Ciao!. ¡Hola!. Hallo!. здравствуйте. !. © 2014 Brain Wrinkles. Languages Gallery Walk . Let’s see if you guessed correctly!. Turing Machine: Languages. Recall that a collection of strings that a TM M accepts is called. the language of M or language recognized by M, denoted L(M).. Definition. A . language is Turing-recognizable (or recursively enumerable) if . Fall 2017. http://cseweb.ucsd.edu/. classes/fa17/cse105-a/. Today's learning goals . Sipser Ch 4.1. Explain what it means for a problem to be decidable.. Justify the use of encoding.. Give examples of decidable problems.. The halting problem is . undecidable. Decidability. Undecidability. decidable  RE  all languages. our goal: prove these containments proper. regular languages. context free languages. all languages. Book: . INTRODUCTION . TO . THE THEORY . OF COMPUTATION. , SECOND . EDITION. , by:. MICHAEL . SIPSER. Reference . 3. Computer Sciences Department. D . E C I D A B I L I T Y. 4. Computer Sciences Department. Umang Mathur. P. Madhusudan. Mahesh Viswanathan. Existing Decidable Classes. Program Verification. Unnatural program models. Undecidable. In general, verification over infinite domains is undecidable. A mother language is spoken by groups of people who become separated by time and distance. Those groups then form new languages based on a common origin.. LANGUAGE FAMILY. : a collection of languages related through a common ancestral language that existed before recorded history. (Indo-European is the world’s most extensive language family.).