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Peter Linz Edition 5 Exercise 12.3 Question 1 (Page No. 317)
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Let $A = \{001, 0011, 11, 101\}$ and $B = \{01, 111, 111, 010\}$. Does the pair $(A, B)$ have a PC solution$?$ Does it have an MPC solution$?$
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Peter Linz Edition 5 Exercise 12.3 Question 5 (Page No. 317,318)
Show that the following modifications of the Post correspondence problem are undecidable. $\text(a)$ There is an MPC solution if there is a sequence of integers such that $w_iw_j...w_kw_1 = v_iv_j...v_kv_i$. $\text(b)$ There is an MPC solution if there is a sequence of integers such that $w_1w_2w_iw_j...w_k = v_1v_2v_iv_j...v_k$.
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Peter Linz Edition 5 Exercise 12.3 Question 4 (Page No. 317)
Suppose we restrict the domain of the Post correspondence problem to include only alphabets with exactly two symbols. Is the resulting correspondence problem decidable$?$
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Peter Linz Edition 5 Exercise 12.3 Question 3 (Page No. 317)
Show that for $|\Sigma| = 1$, the Post correspondence problem is decidable, that is, there is an algorithm that can decide whether or not $(A, B)$ has a $\text{PC}$ solution for any given $(A, B)$ on a single-letter alphabet.
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Peter Linz Edition 5 Exercise 12.3 Question 2 (Page No. 317)
$\text{Theorem}:$ Let $G = (V, T, S, P )$ be an unrestricted grammar, with w any string in $T^+$. Let $(A, B)$ be the correspondence pair constructed from $G$ and $w$ be the process exhibited in Figure. Then the ... string $F$ as $v_1$. The order of the rest of the strings is immaterial. Provide the details of the proof of the Theorem.
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