Talk:Regular tree grammar

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Philosophy: Logic Low‑importance

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	Logic

What is $T_{\Sigma }(N)$ ??

T_\Sigma (N) is used but not defined in the current article! —Preceding unsigned comment added by 93.148.179.121 (talk) 14:15, 19 January 2009 (UTC)[reply]

Indeed! I tried to make an educated guess about the meaning of $T_{\Sigma }(N)$ but couldn't come up with anything for which I had enough confidence to submit. Is it the set of trees with internal nodes from $N$ and leaves from $\Sigma \cup N$ ? That makes the whole grammar seem more like a CFG than anything remotely regular. The lack of this definition is a glaring hole in this article. Help would be appreciated. 19:04, 14 April 2009 (UTC)

Added def. of

T_{\Sigma }(N)

and some more missing explanations, adapted from the book from Tree Automata Techniques and Applications. Also added an example and stated the main closure properties in 2 new sections. Jochen Burghardt (talk) 18:55, 9 May 2013 (UTC)[reply]

What is T Σ ( N ) {\displaystyle T_{\Sigma }(N)} ??

What is $T_{\Sigma }(N)$ ??