File:RegSubsetNP.pdf

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Summary

DescriptionRegSubsetNP.pdf	English: Example to demonstrate that the subset property for regular languages is NP-hard. Given a propositional formula in disjunctive normal form in n variables , a corresponding nondeterministic finite automaton A can be constructed such that it accepts the regular language {0,1}ⁿ if, and only if, the formula is true for all variable assignments. Therefore, the NP-hard problem of deciding the universal validity of a propositional formula in disjunctive normal form can be reduced to the problem of deciding whether {0,1}ⁿ ⊆ L(A). The shown example uses the formula abc+abd+abc+abd+bcd+acd+bcd+acd in n=4 variables. The corresponding automaton A is shown in the upper part of the picture; unlabelled transitions are ε-transitions. Each summand corresponds to one "row" in the automaton A; e.g. the last one, acd, corresponds to the bottommost row of A; the summand is valid exactly for those variable assignments that correspond to a string from the row's accepted language, i.e. {1101,1001} for this row. The language {0,1}ⁿ is regular since it is accepted by the the automaton B shown at the lower picture part.
Date	6 January 2016
Source	Own work
Author	Jochen Burghardt
Other versions	File:RegSubsetNP svg.svg

LaTeX source code

\documentclass[12pt]{article}
\setlength{\unitlength}{1mm}
\usepackage[pdftex]{color}
\usepackage[paperwidth=140\unitlength,paperheight=195\unitlength]{geometry}
\setlength{\topmargin}{-36mm}
\setlength{\textwidth}{140\unitlength}
\setlength{\textheight}{195\unitlength}
\setlength{\oddsidemargin}{-23mm}
\setlength{\parindent}{0cm}
\pagestyle{empty}
% colors
\definecolor{cS}        {rgb}{0.00,0.00,0.40}   % state
\definecolor{cE}        {rgb}{0.40,0.40,0.40}   % epsilon transition
\definecolor{cO}        {rgb}{0.40,0.00,0.00}   % 0 transition
\definecolor{cI}        {rgb}{0.00,0.40,0.00}   % 1 transition

\begin{document}
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% start state
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% eps-transitions to disjoints
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% disjoint a b c
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%
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\textcolor{cS}{\put(110.000,180.000){\circle*{2.000}}}%
% disjoint a \b \d
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\textcolor{cI}{\put(37.000,163.000){\vector(4,-1){10.000}}}%
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%
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%
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\textcolor{cI}{\put(79.000,164.000){\makebox(0.000,0.000)[b]{$1$}}}%
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% disjoint \a \b \c
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%
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%
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% disjoint \a b d
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%
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%
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%
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% disjoint \b c d
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\textcolor{cI}{\put(37.000,103.000){\vector(4,-1){10.000}}}%
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\textcolor{cO}{\put(37.000,96.000){\makebox(0.000,0.000)[t]{$0$}}}%
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%
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%
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%
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\textcolor{cI}{\put(100.000,103.000){\vector(4,-1){10.000}}}%
\textcolor{cI}{\put(100.000,104.000){\makebox(0.000,0.000)[b]{$1$}}}%
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% disjoint \a c \d
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%
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\textcolor{cS}{\put(68.000,80.000){\circle*{2.000}}}%
%
\textcolor{cI}{\put(69.000,80.500){\line(4,1){10.000}}}%
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\textcolor{cI}{\put(79.000,84.000){\makebox(0.000,0.000)[b]{$1$}}}%
\textcolor{cS}{\put(89.000,80.000){\circle*{2.000}}}%
%
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\textcolor{cO}{\put(100.000,76.000){\makebox(0.000,0.000)[t]{$0$}}}%
\textcolor{cS}{\put(110.000,80.000){\circle*{2.000}}}%
% disjoint b \c \d
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\textcolor{cI}{\put(37.000,63.000){\vector(4,-1){10.000}}}%
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%
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%
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%
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% disjoint a \c d
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%
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%
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%
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% eps-transitions from disjoints
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\textcolor{cE}{\put(111.000,160.000){\vector(1,-3){19.800}}}%
\textcolor{cE}{\put(111.000,140.000){\vector(1,-2){19.700}}}%
\textcolor{cE}{\put(111.000,120.000){\vector(1,-1){19.600}}}%
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% final state
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% full language
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%
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%
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%
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%
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\end{picture}
\end{document}

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	19:01, 6 January 2016		825 × 1,150 (11 KB)	Jochen Burghardt	User created page with UploadWizard

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Conversion program	pdfTeX-1.40.3
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Version of PDF format	1.4

File:RegSubsetNP.pdf

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