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s->0A0|1B1|BB A->C B->S|A C->S|null find useless symbol?
example of multitape turing machine
Find a regular expression for the regular language L={w | w is decimal notation for an integer that is a multiple of 4}
examples of decidable problems
One might assume that non-closure under concatenation would imply non closure under both Kleene- and positive closure, since the concatenation of a language with itself is included
Both L 1 and L 2 are SL 2 . (You should verify this by thinking about what the automata look like.) We claim that L 1 ∪ L 2 ∈ SL 2 . To see this, suppose, by way of con
Normal forms are important because they give us a 'standard' way of rewriting and allow us to compare two apparently different grammars G1 and G2. The two grammars can be shown to
wht is pumping lema
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