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Local Weighted Tree Languages [PDF]

open access: yesActa Cybernetica, 2015
Local weighted tree languages over semirings are introduced. For an arbitrary semiring, a weighted tree language is shown to be recognizable if it appears as the image of a local weighted tree language under a deterministic ...
Fülöp Zoltán
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Classes of Tree Languages and DR Tree Languages Given by Classes of Semigroups [PDF]

open access: yesActa Cybernetica, 2011
In the first section of the paper we give general conditions under which a class of recognizable tree languages with a given property can be defined by a class of monoids or semigroups defining the class of string languages having the same property.
Gécseg Ferenc
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