Language of this finite state automaton?












1












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What would be the formal definition of the language for the following Finite State Automaton?



FSA










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  • 4




    $begingroup$
    Finite sequences of $a$'s and $b$'s that either end with a $b$ or end with $ba$.
    $endgroup$
    – irchans
    Jan 15 at 19:29






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    Is the word $b$ accepted or rejected by this automaton? What about $bab$?
    $endgroup$
    – Cheyne H
    Jan 15 at 19:31












  • $begingroup$
    @irchans The string $b$ wouldn't qualify as an accepted word right? Since it can also be returning to state $q_0$?
    $endgroup$
    – Ansar Al
    Jan 15 at 19:31






  • 2




    $begingroup$
    @CheyneH This is a nondeterministic finite state automaton, for which multiple (or no) transitions for a given pair of state and symbol is well-defined.
    $endgroup$
    – Math1000
    Jan 15 at 19:42






  • 2




    $begingroup$
    Just "$b$" is fine. You start in q0 and then transition to q1 and terminate.
    $endgroup$
    – irchans
    Jan 15 at 20:57
















1












$begingroup$


What would be the formal definition of the language for the following Finite State Automaton?



FSA










share|cite|improve this question









$endgroup$








  • 4




    $begingroup$
    Finite sequences of $a$'s and $b$'s that either end with a $b$ or end with $ba$.
    $endgroup$
    – irchans
    Jan 15 at 19:29






  • 1




    $begingroup$
    Is the word $b$ accepted or rejected by this automaton? What about $bab$?
    $endgroup$
    – Cheyne H
    Jan 15 at 19:31












  • $begingroup$
    @irchans The string $b$ wouldn't qualify as an accepted word right? Since it can also be returning to state $q_0$?
    $endgroup$
    – Ansar Al
    Jan 15 at 19:31






  • 2




    $begingroup$
    @CheyneH This is a nondeterministic finite state automaton, for which multiple (or no) transitions for a given pair of state and symbol is well-defined.
    $endgroup$
    – Math1000
    Jan 15 at 19:42






  • 2




    $begingroup$
    Just "$b$" is fine. You start in q0 and then transition to q1 and terminate.
    $endgroup$
    – irchans
    Jan 15 at 20:57














1












1








1





$begingroup$


What would be the formal definition of the language for the following Finite State Automaton?



FSA










share|cite|improve this question









$endgroup$




What would be the formal definition of the language for the following Finite State Automaton?



FSA







automata finite-state-machine






share|cite|improve this question













share|cite|improve this question











share|cite|improve this question




share|cite|improve this question










asked Jan 15 at 19:21









Ansar AlAnsar Al

466




466








  • 4




    $begingroup$
    Finite sequences of $a$'s and $b$'s that either end with a $b$ or end with $ba$.
    $endgroup$
    – irchans
    Jan 15 at 19:29






  • 1




    $begingroup$
    Is the word $b$ accepted or rejected by this automaton? What about $bab$?
    $endgroup$
    – Cheyne H
    Jan 15 at 19:31












  • $begingroup$
    @irchans The string $b$ wouldn't qualify as an accepted word right? Since it can also be returning to state $q_0$?
    $endgroup$
    – Ansar Al
    Jan 15 at 19:31






  • 2




    $begingroup$
    @CheyneH This is a nondeterministic finite state automaton, for which multiple (or no) transitions for a given pair of state and symbol is well-defined.
    $endgroup$
    – Math1000
    Jan 15 at 19:42






  • 2




    $begingroup$
    Just "$b$" is fine. You start in q0 and then transition to q1 and terminate.
    $endgroup$
    – irchans
    Jan 15 at 20:57














  • 4




    $begingroup$
    Finite sequences of $a$'s and $b$'s that either end with a $b$ or end with $ba$.
    $endgroup$
    – irchans
    Jan 15 at 19:29






  • 1




    $begingroup$
    Is the word $b$ accepted or rejected by this automaton? What about $bab$?
    $endgroup$
    – Cheyne H
    Jan 15 at 19:31












  • $begingroup$
    @irchans The string $b$ wouldn't qualify as an accepted word right? Since it can also be returning to state $q_0$?
    $endgroup$
    – Ansar Al
    Jan 15 at 19:31






  • 2




    $begingroup$
    @CheyneH This is a nondeterministic finite state automaton, for which multiple (or no) transitions for a given pair of state and symbol is well-defined.
    $endgroup$
    – Math1000
    Jan 15 at 19:42






  • 2




    $begingroup$
    Just "$b$" is fine. You start in q0 and then transition to q1 and terminate.
    $endgroup$
    – irchans
    Jan 15 at 20:57








4




4




$begingroup$
Finite sequences of $a$'s and $b$'s that either end with a $b$ or end with $ba$.
$endgroup$
– irchans
Jan 15 at 19:29




$begingroup$
Finite sequences of $a$'s and $b$'s that either end with a $b$ or end with $ba$.
$endgroup$
– irchans
Jan 15 at 19:29




1




1




$begingroup$
Is the word $b$ accepted or rejected by this automaton? What about $bab$?
$endgroup$
– Cheyne H
Jan 15 at 19:31






$begingroup$
Is the word $b$ accepted or rejected by this automaton? What about $bab$?
$endgroup$
– Cheyne H
Jan 15 at 19:31














$begingroup$
@irchans The string $b$ wouldn't qualify as an accepted word right? Since it can also be returning to state $q_0$?
$endgroup$
– Ansar Al
Jan 15 at 19:31




$begingroup$
@irchans The string $b$ wouldn't qualify as an accepted word right? Since it can also be returning to state $q_0$?
$endgroup$
– Ansar Al
Jan 15 at 19:31




2




2




$begingroup$
@CheyneH This is a nondeterministic finite state automaton, for which multiple (or no) transitions for a given pair of state and symbol is well-defined.
$endgroup$
– Math1000
Jan 15 at 19:42




$begingroup$
@CheyneH This is a nondeterministic finite state automaton, for which multiple (or no) transitions for a given pair of state and symbol is well-defined.
$endgroup$
– Math1000
Jan 15 at 19:42




2




2




$begingroup$
Just "$b$" is fine. You start in q0 and then transition to q1 and terminate.
$endgroup$
– irchans
Jan 15 at 20:57




$begingroup$
Just "$b$" is fine. You start in q0 and then transition to q1 and terminate.
$endgroup$
– irchans
Jan 15 at 20:57










1 Answer
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$begingroup$

Your language consists of all words over ${a,b}$ ending in $b$ or in $ba$. You can write it as a regular expression:
$$ (a+b)^*b(epsilon + a). $$






share|cite|improve this answer









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    1






    active

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    0












    $begingroup$

    Your language consists of all words over ${a,b}$ ending in $b$ or in $ba$. You can write it as a regular expression:
    $$ (a+b)^*b(epsilon + a). $$






    share|cite|improve this answer









    $endgroup$


















      0












      $begingroup$

      Your language consists of all words over ${a,b}$ ending in $b$ or in $ba$. You can write it as a regular expression:
      $$ (a+b)^*b(epsilon + a). $$






      share|cite|improve this answer









      $endgroup$
















        0












        0








        0





        $begingroup$

        Your language consists of all words over ${a,b}$ ending in $b$ or in $ba$. You can write it as a regular expression:
        $$ (a+b)^*b(epsilon + a). $$






        share|cite|improve this answer









        $endgroup$



        Your language consists of all words over ${a,b}$ ending in $b$ or in $ba$. You can write it as a regular expression:
        $$ (a+b)^*b(epsilon + a). $$







        share|cite|improve this answer












        share|cite|improve this answer



        share|cite|improve this answer










        answered Jan 16 at 21:17









        Yuval FilmusYuval Filmus

        48.6k471145




        48.6k471145






























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