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Ullman (TOC) Edition 3 Exercise 9.3 Question 4 (Page No. 400)

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admin asked Jul 21, 2019
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Ullman (TOC) Edition 3 Exercise 9.3 Question 7 (Page No. 400 - 401)
Show that the following problems are not recursively enumerable: The set of pairs $(M,w)$ such that $TM \ M$, started with input $w$, does not halt. The set of pairs $(M_{1},M_{2})$ ... $TM's$.
Show that the following problems are not recursively enumerable:The set of pairs $(M,w)$ such that $TM \ M$, started with input $w$, does not halt.The set of pairs $(M_{1...
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Ullman (TOC) Edition 3 Exercise 9.3 Question 5 (Page No. 400)
Let $L$ be the language consisting of pairs of $TM$ codes plus an integer, $(M_{1},M_{2},k)$, such that $L(M_{1})\cap L(M_{2})$ contains at least $k$ strings. Show that $L$ is $RE$, but recursive.
Let $L$ be the language consisting of pairs of $TM$ codes plus an integer, $(M_{1},M_{2},k)$, such that $L(M_{1})\cap L(M_{2})$ contains at least $k$ strings. Show that $...
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Ullman (TOC) Edition 3 Exercise 9.3 Question 3 (Page No. 400)
Show that the language of codes for $TM's\ M$ that, when started with blank tape, eventually write a $1$ somewhere on the tape is undecidable.
Show that the language of codes for $TM's\ M$ that, when started with blank tape, eventually write a $1$ somewhere on the tape is undecidable.
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