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A problem is said to be unsolvable if no algorithm can solve it. The problem is said to be undecidable if it is a decision problem and no algorithm can decide it. It should be noted that an unsolvable problem might be partially solvable by an algorithm that makes a complete search for a solution. In such case the solution is eventually found whenever it is defined, but the search might continue forever whenever the solution is undefined. Similarly, an undecidable problem might also be partially decidable by an algorithm that makes an exhaustive search.
s-> AACD A-> aAb/e C->aC/a D-> aDa/bDb/e
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
As we are primarily concerned with questions of what is and what is not computable relative to some particular model of computation, we will usually base our explorations of langua
what is a bus and draw a single bus structure
Find the Regular Grammar for the following Regular Expression: a(a+b)*(ab*+ba*)b.
State & prove pumping lemma for regular set. Show that for the language L={ap |p is a prime} is not regular
what is regular expression?
Find a regular expression for the regular language L={w | w is decimal notation for an integer that is a multiple of 4}
#can you solve a problem of palindrome using turing machine with explanation and diagrams?
Our primary concern is to obtain a clear characterization of which languages are recognizable by strictly local automata and which aren't. The view of SL2 automata as generators le
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