Ullman (TOC) Edition 3 Exercise 9.4 Question 3 (Page No. 412)

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Ullman (TOC) Edition 3 Exercise 9.4 Question 2 (Page No. 412)
We showed that $PCP$ was undecidable, but we assumed that the alphabet $\Sigma$ could be arbitrary. Show that $PCP$ is undecidable even if we limit the alphabet to $\Sigma = \left\{0,1\right\}$ by reducing $PCP$ to this special case of $PCP$.

We showed that $PCP$ was undecidable, but we assumed that the alphabet $\Sigma$ could be arbitrary. Show that $PCP$ is undecidable even if we limit the alphabet to $\Sigm...

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Ullman (TOC) Edition 3 Exercise 9.4 Question 4 (Page No. 412)
A Post tag system consists of a set of pairs of strings chosen from some finite alphabet $\Sigma$ and a start string. If $(w,x)$ is a pair, and $y$ is any string over $\Sigma$, we say that $wy\vdash yx$. That is ... . If $M$ enters an accepting state, arrange that the current strings can eventually be erased, i.e., reduced to $\epsilon$.

A Post tag system consists of a set of pairs of strings chosen from some finite alphabet $\Sigma$ and a start string. If $(w,x)$ is a pair, and $y$ is any string over $\S...

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Ullman (TOC) Edition 3 Exercise 9.4 Question 1 (Page No. 412)
Tell whether each of the following instances of $PCP$ has a solution. Each is presented as two lists $A$ and $B$, and the $i^{th}$ strings on the two lists correspond for each $i = 1,2,\cdot\cdot\cdot\cdot$ $A=(01,001,10); \ B = (011,10,00).$ $A=(01,001,10); \ B = (011,01,00).$ $A=(ab,a,bc,c); \ B = (bc,ab,ca,a).$

Tell whether each of the following instances of $PCP$ has a solution. Each is presented as two lists $A$ and $B$, and the $i^{th}$ strings on the two lists correspond for...

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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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tags	tag:apple
author	user:martin
title	title:apple
content	content:apple
exclude	-tag:apple
force match	+apple
views	views:100
score	score:10
answers	answers:2
is accepted	isaccepted:true
is closed	isclosed:true

Ullman (TOC) Edition 3 Exercise 9.4 Question 3 (Page No. 412)

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