pushdown automata (pda)

More documents

Recommendations

Info

LL GrammarRecall that in the s-grammar, the parsing is linear-time.There is only one candidate rule to use when we lookat the first variable in sentential form and the firstsymbol in the unmatched part of input string.s-grammar is a special case of the class of LLgrammars. LL means we are scanning the symbolsfrom left-to-right and we are constructing the leftmostderivation.More generally, with a LL(k) grammar, we can identifythe correct rule given the next k symbols in the input.Apparently the parsing can be done very quickly.Pushdown Automata – p. 22
Pumping LemmaLet L be an infinite context-free language. Then thereexists some positive integer m such that any w ∈ Lwith |w| ≥ m can be decomposed asw = uvxyz,withsuch that|vxy| ≤ m, |vy| ≥ 1,uv i xy i z ∈ L for i = 0, 1, 2,... .This is known as the pumping lemma for context-freelanguages.Pushdown Automata – p. 23
Page 1 and 2: Pushdown AutomataNotes on Automata
Page 3 and 4: Pushdown AutomataA nondeterministic
Page 5 and 6: Examples of δSuppose δ(q 1 ,a,b)
Page 7 and 8: Language Accepted by An npdaLet M =
Page 9 and 10: Another ExampleConsider the set L =
Page 12: Proof L(G) ⊆ L(M)Consider partial
Page 15 and 16: Basic IdeaHere we want the sententi
Page 17 and 18: ProofWe show that for all q i ,q j
Page 19 and 20: Deterministic cfgA language L is sa
Page 21: Grammars for Compiler DesignThe dec
Page 25 and 26: Closure PropertiesThe set of contex
Page 27 and 28: Regular IntersectionLet L 1 be cont

pushdown automata (pda)

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?