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So we have that every language that can be constructed from SL languages using Boolean operations and concatenation (that is, every language in LTO) is recognizable but there are recognizable languages that cannot be constructed in this way. The one fundamental operation that LTO was not closed under was Kleene closure. It's worth asking, then, how the class of recognizable languages fairs under Kleene closure.
Find a regular expression for the regular language L={w | w is decimal notation for an integer that is a multiple of 4}
matlab v matlab
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
Application of the general suffix substitution closure theorem is slightly more complicated than application of the specific k-local versions. In the specific versions, all we had
A.(A+C)=A
We saw earlier that LT is not closed under concatenation. If we think in terms of the LT graphs, recognizing the concatenation of LT languages would seem to require knowing, while
(c) Can you say that B is decidable? (d) If you somehow know that A is decidable, what can you say about B?
write short notes on decidable and solvable problem
State and Prove the Arden's theorem for Regular Expression
#can you solve a problem of palindrome using turing machine with explanation and diagrams?
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