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The Recognition Problem for a class of languages is the question of whether a given string is a member of a given language. An instance consists of a string and a (?nite) speci?cation of the language. Again, we'll assume we are given a DFA as a ?ve-tuple.
Theorem 3 (Recognition) The Recognition Problem for Regular Languages is decidable.
This close relationship between the SL2 languages and the recognizable languages lets us use some of what we know about SL 2 to discover properties of the recognizable languages.
S-->AAA|B A-->aA|B B-->epsilon
It is not hard to see that ε-transitions do not add to the accepting power of the model. The underlying idea is that whenever an ID (q, σ v) directly computes another (p, v) via
proof of arden''s theoram
value chain
what are the advantages and disadvantages of wearable computers?
Exercise Show, using Suffix Substitution Closure, that L 3 . L 3 ∈ SL 2 . Explain how it can be the case that L 3 . L 3 ∈ SL 2 , while L 3 . L 3 ⊆ L + 3 and L + 3 ∈ SL
unification algorithm
Find the Regular Grammar for the following Regular Expression: a(a+b)*(ab*+ba*)b.
Construct a Mealy machine that can output EVEN or ODD According to the total no. of 1''s encountered is even or odd.
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