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Merge pull request #1 from mathiasvh/master
Taal-, syntax en inhoudsfouten verbeterd
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Stel $DFA_1$ ($Q_1$, $\Sigma$, $\delta_1$, $q_s$, $F_1$) met $Q_1 = \{q_s,q_1,q_2,...,q_n\}$ is een machine zonder onbereikbare toestanden waarvan elk paar toestanden f-verschillend zijn. Stel dat $DFA_2$ ($Q_2$, $\Sigma$, $\delta_2$, $q_s$, $F_2$) een DFA is met minder toestanden dan $DFA_1$. | ||
Stel $DFA_1$ ($Q_1$, $\Sigma$, $\delta_1$, $q_s$, $F_1$) met $Q_1 = \{q_s,q_1,q_2,...,q_n\}$ is een machine zonder onbereikbare toestanden waarvan elk paar toestanden f-verschillend zijn. Stel dat $DFA_2$ ($Q_2$, $\Sigma$, $\delta_2$, $p_s$, $F_2$) een DFA is met minder toestanden dan $DFA_1$. | ||
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\begin{itemize} | ||
\item Elke toestand in $DFA_1$ is bereikbaar, dus er bestaan strings $s_i$ met $i=1...n$ zodanig dat $\delta^*_1(q_s,s_i)=q_i$. | ||
\item $DFA_2$ heeft minder toestanden dan $DFA_1$, dus er is een $i$ en $j$ met $i \neq j$, zodanig dat er strings $s_i$ en $s_j$ zijn waarvoor $DFA_2$ meerdere keren in dezelfde toestand komen, dus $\delta^*_2(q_s,s_i)=\delta^*_2(q_s,s_j)$. | ||
\item $DFA_2$ heeft minder toestanden dan $DFA_1$, dus er is een $i$ en $j$ met $i \neq j$, zodanig dat er strings $s_i$ en $s_j$ zijn waarvoor $DFA_2$ meerdere keren in dezelfde toestand komen, dus $\delta^*_2(p_s,s_i)=\delta^*_2(p_s,s_j)$. | ||
\item $q_i$ en $q_j$ zijn f-verschillend, dus er bestaat een string $v$ zodanig dat $\delta^*_1(q_i,v) \in F_1 \en \delta^*_1(q_j,v) \notin F_1$ of omgekeerd. Bij gevolg geldt ook $\delta^*_1(q_s,s_iv) \in F_1 \en \delta^*_1(q_s,q_jv) \notin F_1$ of omgekeerd. We zeggen dat $DFA_1$ van $s_iv$ en $s_jv$ just \'e\'en string accepteert. | ||
\end{itemize} | ||
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We kunnen nu aantonen dat $\delta^*_2(q_s,s_iv) = \delta^*_2(\delta^*_2(q_i),v) = \delta^*_2(\delta^*_2(q_j),v) = \delta^*_2(q_s,s_jv)$, wat betekent dat $DFA_1$ en $DFA_2$ niet dezelfde taal kunnen bepalen. | ||
We kunnen nu aantonen dat $\delta^*_2(p_s,s_iv) = \delta^*_2(\delta^*_2(p_s,s_i),v) = \delta^*_2(\delta^*_2(p_s,s_j),v) = \delta^*_2(p_s,s_jv)$, hetgeen betekent dat $DFA_2$ ofwel beide strings $s_iv$ en $s_jv$ accepteert, ofwel beide verwerpt. | ||
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Dus $DFA_1$ en $DFA_2$ kunnen niet dezelfde taal bepalen. |
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Church-Rosser II verwijst naar de tweede stelling van Church en Rosser. Die stelling zegt dat indien $E \stackrel{*}{\longleftrightarrow} N$ bestaat met $N$ in normaalvorm, dat er een rij reducties moet bestaan in normaal orde van $E$ naar $N$. | ||
Church-Rosser II verwijst naar de tweede stelling van Church en Rosser. Die stelling zegt dat indien $E \stackrel{*}{\longleftrightarrow} N$ bestaat met $N$ in normaalvorm, dat er een reductierij moet bestaan in normaalorde van $E$ naar $N$. |
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