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Michael Sipser Edition 3 Exercise 4 Question 1 (Page No. 210)
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Michael Sipser Edition 3 Exercise 4 Question 3 (Page No. 211)
Let $ALL_{DFA} = \{ \langle{ A }\rangle \mid A \text{ is a DFA and}\: L(A) = \Sigma^{\ast}\}.$ Show that $ALL_{DFA}$ is decidable.
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Oct 20, 2019
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Michael Sipser Edition 3 Exercise 5 Question 27 (Page No. 241)
A two-dimensional finite automaton $(2DIM-DFA)$ is defined as follows. The input is an $m \times n$ rectangle, for any $m, n \geq 2$ ... of determining whether two of these machines are equivalent. Formulate this problem as a language and show that it is undecidable.
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Michael Sipser Edition 3 Exercise 5 Question 26 (Page No. 240)
Define a two-headed finite automaton $(2DFA)$ to be a deterministic finite automaton that has two read-only, bidirectional heads that start at the left-hand end of the input tape and can be independently controlled to move in either direction. The tape ... $E_{2DFA}$ is not decidable.
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Michael Sipser Edition 3 Exercise 3 Question 4 (Page No. 187)
Give a formal definition of an enumerator. Consider it to be a type of two-tape Turing machine that uses its second tape as the printer. Include a definition of the enumerated language.
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