Alternative Characterizations and Relation To Other Formal Languages
As shown by Rajeev Alur and Parthasarathy Madhusudan the class of regular tree languages coincides with nested words and visibly pushdown languages.
The regular tree languages are also the languages recognized by bottom-up tree automata and nondeterministic top-down tree automata.
Regular tree grammars are a generalization of regular word grammars.
Read more about this topic: Regular Tree Grammar
Famous quotes containing the words alternative, relation, formal and/or languages:
“If you have abandoned one faith, do not abandon all faith. There is always an alternative to the faith we lose. Or is it the same faith under another mask?”
—Graham Greene (1904–1991)
“The proper study of mankind is man in his relation to his deity.”
—D.H. (David Herbert)
“Good gentlemen, look fresh and merrily.
Let not our looks put on our purposes,
But bear it as our Roman actors do,
With untired spirits and formal constancy.”
—William Shakespeare (1564–1616)
“Wealth is so much the greatest good that Fortune has to bestow that in the Latin and English languages it has usurped her name.”
—William Lamb Melbourne, 2nd Viscount (1779–1848)