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slide 1fall 2006costas busch - rpi1 decidable languages slide 2 fall 2006costas busch - rpi2 recall that: a language is turing-acceptable if there is a turing machine that…
slide 1 fall 2006costas busch - rpi1 regular expressions slide 2 fall 2006costas busch - rpi2 regular expressions regular expressions describe regular languages example:…
slide 1fall 2006costas busch - rpi1 context-free languages slide 2 fall 2006costas busch - rpi2 regular languages context-free languages slide 3 fall 2006costas busch - rpi3…
slide 1fall 2006costas busch - rpi1 a universal turing machine slide 2 fall 2006costas busch - rpi2 turing machines are hardwired they execute only one program a limitation…
slide 1 fall 2006costas busch - rpi1 undecidable problems (unsolvable problems) slide 2 fall 2006costas busch - rpi2 recall that: a language is decidable, if there is a turing…
the post correspondence problem costas busch - rpi some undecidable problems for context-free languages: is context-free grammar ambiguous? is ? are context-free grammars…
slide 1fall 2006costas buch - rpi1 simplifications of context-free grammars slide 2 fall 2006costas buch - rpi2 a substitution rule substitute equivalent grammar slide 3…
slide 1 fall 2006costas busch - rpi1 non-regular languages (pumping lemma) slide 2 fall 2006costas busch - rpi2 regular languages non-regular languages slide 3 fall 2006costas…
slide 1 fall 2006costas busch - rpi1 more applications of the pumping lemma slide 2 fall 2006costas busch - rpi2 the pumping lemma: given a infinite regular language there…
slide 1 fall 2006costas busch - rpi1 deterministic finite automata and regular languages slide 2 fall 2006costas busch - rpi2 deterministic finite automaton (dfa) input tape…
slide 1fall 2006costas busch - rpi1 turing machines slide 2 fall 2006costas busch - rpi2 the language hierarchy regular languages context-free languages ? ? slide 3 fall…
slide 1fall 2006costas busch - rpi1 time complexity slide 2 fall 2006costas busch - rpi2 consider a deterministic turing machine which decides a language slide 3 fall 2006costas…
slide 1 fall 2006costas busch - rpi1 turing’s thesis slide 2 fall 2006costas busch - rpi2 turing’s thesis (1930): any computation carried out by mechanical means can…
slide 1 fall 2006costas busch - rpi1 languages slide 2 fall 2006costas busch - rpi2 language: a set of strings string: a sequence of symbols from some alphabet example: strings:…
slide 1fall 2006costas busch - rpi1 reductions slide 2 fall 2006costas busch - rpi2 problem is reduced to problem if we can solve problem then we can solve problem slide…
sift on fall 2006 costas busch - rpi 1 deterministic finite automaton (dfa) input tape âacceptâ or ârejectâ string finite automaton output fall 2006 costas busch - rpi…
slide 1 fall 2003costas busch - rpi1 decidability slide 2 fall 2003costas busch - rpi2 recall: a language is decidable (recursive), if there is a turing machine (decider)…
decidable and semi-decidable input machine−→ • accept • reject • loop forever. for a language l if there is some turing machine that accepts every…
decidable and undecidable problems deciding regular languages and cfl’s undecidable problems deciding cfls useful to have an efficient algorithm to decide whether string…
cs311 computational structures decidable and undecidable problems 1 lecture 15 andrew black andrew tolmach monday 24 may 2010 recall: recognizable vs decidable • a language…