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S-->AAA|B A-->aA|B B-->epsilon
(c) Can you say that B is decidable? (d) If you somehow know that A is decidable, what can you say about B?
Theorem (Myhill-Nerode) A language L ⊆ Σ is recognizable iff ≡L partitions Σ* into ?nitely many Nerode equivalence classes. Proof: For the "only if" direction (that every recogn
State & prove pumping lemma for regular set. Show that for the language L={ap |p is a prime} is not regular
De?nition (Instantaneous Description) (for both DFAs and NFAs) An instantaneous description of A = (Q,Σ, δ, q 0 , F) , either a DFA or an NFA, is a pair h q ,w i ∈ Q×Σ*, where
Find the Regular Grammar for the following Regular Expression: a(a+b)*(ab*+ba*)b.
The generalization of the interpretation of strictly local automata as generators is similar, in some respects, to the generalization of Myhill graphs. Again, the set of possible s
Computer has a single LIFO stack containing ?xed precision unsigned integers (so each integer is subject to over?ow problems) but which has unbounded depth (so the stack itself nev
State and Prove the Arden's theorem for Regular Expression
In Exercise 9 you showed that the recognition problem and universal recognition problem for SL2 are decidable. We can use the structure of Myhill graphs to show that other problems
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