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David Kauchak CS30 Spring 2016 Grammars What is a grammar Grammars Language view A grammar is a set of structural rules that govern the composition of sentences phrases and words Computational view. Sipser. 4.1 (pages 165-173). Hierarchy of languages. All languages. Turing-recognizable. Turing-decidable. Context-free languages. Regular languages. 0. n. 1. n. a. n. b. n. c. n. D. 0. *. 1. *. Describing Turing machine input. CHOMSKY NORMAL . FORM. SRIKANTH . PATHURI. THEORY OF AUTOMATA, SPRING . 2012. Georgia State University. 1. CHOMSKY Normal form. Definition: . A CFG is said to be in . Chomsky. normal form if every production is of one of . #PassiveTelnet Passiveyes#[cfg.passive telnet]@f0,1g #X11forward X11no#[cfg.x11 forward]@f0,1g #Agentforward Agentforwardyes#[cfg.agentfwd]@f0,1g #Don'tallowauthenticatedusers. NoUserAuthno#[cfg.ssh n May . 2015. 1. M15. Reader Advisories. The information in this presentation contains certain forward-looking statements. All statements other than statements of historical fact may be forward-looking statements. Forward-looking statements are often, but not always, identified by the use of words such as "seek", "anticipate", “plan", "continue", "estimate", "demonstrate", "expect", "may", "will", "project", "predict", "potential", "targeting", "intend", "could", "might", "should", "believe", "would" and similar expressions and include statements relating to, among other things, the anticipated ongoing strategy of Canadian Foresight Group Pte. Ltd. (. Design, Proof. , Structure. MA/CSSE 474. Theory of Computation. Your Questions?. Previous class days' material. Reading Assignments. HW 9 problems. Exam 2. Anything else. Designing Context-Free Grammars. Reading: Chapter 7. 2. Topics . Simplifying CFGs, Normal forms. Pumping lemma for CFLs. Closure and decision properties of CFLs. 3. How to “simplify” CFGs?. 4. Three ways to simplify/clean a CFG. Grammars. (CFLs & CFGs). Reading: Chapter 5. Not all languages are regular. So what happens to the languages which are not regular?. Can we still come up with a language recognizer?. i.e., something that will accept (or reject) strings that belong (or do not belong) to the language?. @. BenReser. http://. svn.ms. /. autosvnslides. Subversion Committer working at . WANdisco. since 2012.. Started working on Perl Bindings in 2003 to automate Subversion as a replacement for CVS. Never finished the project that inspired the work and ended up working on Subversion itself.. David Kauchak. CS30 – Spring . 2016. Admin. Lab/neural net package?. Assignment 6. Grammars. Language view: . A grammar is a set of structural rules that govern the composition of sentences, phrases and words.. Reading: Chapter 6. 2. PDA - the automata for CFLs. What is?. FA to Reg Lang, PDA is to CFL. PDA == [. . . . -NFA + “a stack” ]. Why a stack?. . -NFA. A stack filled with “stack symbols”. Adopted From U Penn . CIS 570: Modern Programming Language Implementation (Autumn 2006). Data flow analysis. D. erives . information about . the. . dynamic. . behavior . of a . program . by . only examining . for Security and Privacy. Manuel . Egele. megele@cmu.edu. Carnegie Mellon University. Mobile Devices are Ubiquitous. 400 . million . iOS. devices . in . total. (June 2012). 400 million Android devices in . some slides adapted from Ray Mooney. Admin. Assignment 3 out: due next Monday. Quiz #1. Context free grammar. S . . NP VP. left hand side. (single symbol). right hand side. (one or more symbols). CS30 – Spring 2015. Admin. Today’s mentor hours moved to 6-8pm. Assignment . 4 graded. Assignment 5. . - how’s it going?. . - part A due tonight at 11:59pm. . - part B due Friday at 6pm. Course feedback.