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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.

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Showing 1 to 2 of 2 (0.072 seconds)

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1

Expressing Context-Free Tree Languages by Regular Tree Grammars

Teichmann, Markus 29 May 2017 (has links) (PDF)
In this thesis, three methods are investigated to express context-free tree languages by regular tree grammars. The first method is a characterization. We show restrictions to context-free tree grammars such that, for each restricted context-free tree grammar, a regular tree grammar can be constructed that induces the same tree language. The other two methods are approximations. An arbitrary context-free tree language can be approximated by a regular tree grammar with a restricted pushdown storage. Furthermore, we approximate weighted context-free tree languages, induced by weighted linear nondeleting context-free tree grammars, by showing how to approximate optimal weights for weighted regular tree grammars.
Baumsprache
kontextfrei
regulär
formale Sprache
gewichtete Grammatik
gewichtete Baumgrammatik
Approximation
Training
tree language
context-free
regular
formal grammar
weighted grammar
weighted tree language
approximation
training
ddc:004
rvk:ST 240
2

Expressing Context-Free Tree Languages by Regular Tree Grammars

Teichmann, Markus 12 April 2017 (has links)
In this thesis, three methods are investigated to express context-free tree languages by regular tree grammars. The first method is a characterization. We show restrictions to context-free tree grammars such that, for each restricted context-free tree grammar, a regular tree grammar can be constructed that induces the same tree language. The other two methods are approximations. An arbitrary context-free tree language can be approximated by a regular tree grammar with a restricted pushdown storage. Furthermore, we approximate weighted context-free tree languages, induced by weighted linear nondeleting context-free tree grammars, by showing how to approximate optimal weights for weighted regular tree grammars.
info:eu-repo/classification/ddc/004
ddc:004

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