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expressing_finite_automata_in_msol_over_strings [2009/04/29 11:09]
vkuncak
expressing_finite_automata_in_msol_over_strings [2010/05/21 02:31]
vkuncak
Line 18: Line 18:
 \end{equation*} \end{equation*}
  
-To express the property that an automaton accepts a string whose length is given by free variable $k$ we then use formula+To express the property that an automaton accepts a string whose length is given by free variable $k$ we then use formula ​$F$:
 \begin{equation*} \begin{equation*}
   \exists Q_0,\ldots, Q_m.\ \mbox{Init} \land (\forall p. p \leq k \rightarrow \mbox{Trans}) \land \mbox{Final}   \exists Q_0,\ldots, Q_m.\ \mbox{Init} \land (\forall p. p \leq k \rightarrow \mbox{Trans}) \land \mbox{Final}
 \end{equation*} \end{equation*}
  
 +Then the word is accepted if the above formula holds for the entire input
 +\[
 +   ​\exists k. (F \land \forall p. k < p \rightarrow \bigwedge_i p \notin v_i)
 +\]