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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…
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 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 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 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 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 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…
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 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…
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 prof. busch - lsu1 reductions slide 2 prof. busch - lsu2 problem is reduced to problem if we can solve problem then we can solve problem slide 3 prof. busch - lsu3…
slide 1 courtesy costas busch - rpi1 reducibility slide 2 courtesy costas busch - rpi2 problem is reduced to problem if we can solve problem then we can solve problem slide…
costas busch - lsu3 we need a tool to prove that the previous problems for context-free languages are undecidable: the post correspondence problem
slide 1fall 2006costas buch - rpi1 simplifications of context-free grammars slide 2 fall 2006costas buch - rpi2 a substitution rule substitute equivalent grammar slide 3…
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