automaton.ambiguous_word

Return an ambiguous word, or raise if the automaton is unambiguous.

Preconditions:

Postconditions:

Examples



In [1]:

    
import vcsn









    



:0: FutureWarning: IPython widgets are experimental and may change in the future.



In [2]:

    
a = vcsn.context('lal_char(abcd), b').expression('abc').standard()
a









    Out[2]:



In [3]:

    
a.is_ambiguous()









    Out[3]:





False



In [4]:

    
try:
    a.ambiguous_word()
except RuntimeError as err:
    print("error:", err)









    



error: automaton is unambiguous



In [5]:

    
a = a + a
a









    Out[5]:



In [6]:

    
a.ambiguous_word()









    Out[6]:





$\mathit{abc}$