Results 281 to 290 of about 170,686 (340)
Some of the next articles are maybe not open access.
Generalized context‐free grammars and multiple context‐free grammars
Systems and Computers in Japan, 1989AbstractIt is shown that the class of languages generated by generalized context‐free grammars (gcfg's) introduced by Pollard is exactly the class of recursively enumerable sets. Next, a subclass of gcfg's called multiple context‐free grammars (mcfg's) is introduced and it is shown that the class of languages generated by mcfg's properly contains the ...
Hiroyuki Seki +2 more
openaire +2 more sources
Acta Informatica, 1994
A text is a triple \(\tau=(\lambda,\rho_ 1,\rho_ 2)\) such that \(\lambda\) is a labeling function, and \(\rho_ 1\) and \(\rho_ 2\) are linear orders on the domain of \(\lambda\); hence \(\tau\) may be seen as a word \((\lambda,\rho_ 1)\) together with an additional linear order \(\rho_ 2\) on the domain of \(\lambda\). The order \(\rho_ 2\) is used to
P. ten Pas +2 more
openaire +3 more sources
A text is a triple \(\tau=(\lambda,\rho_ 1,\rho_ 2)\) such that \(\lambda\) is a labeling function, and \(\rho_ 1\) and \(\rho_ 2\) are linear orders on the domain of \(\lambda\); hence \(\tau\) may be seen as a word \((\lambda,\rho_ 1)\) together with an additional linear order \(\rho_ 2\) on the domain of \(\lambda\). The order \(\rho_ 2\) is used to
P. ten Pas +2 more
openaire +3 more sources
Grammars, 2002
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
openaire +2 more sources
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
openaire +2 more sources
2019
Context-free grammars represent language-generating rewriting systems. Each of their rewriting rules has a single symbol on its left-hand sides. By repeatedly applying these rules, these grammars generate sentences of their languages. This chapter gives a mathematical introduction into context-free grammars.
Petr Horacek +2 more
openaire +2 more sources
Context-free grammars represent language-generating rewriting systems. Each of their rewriting rules has a single symbol on its left-hand sides. By repeatedly applying these rules, these grammars generate sentences of their languages. This chapter gives a mathematical introduction into context-free grammars.
Petr Horacek +2 more
openaire +2 more sources
2016
In this chapter the authors introduce context-free grammars, and they explain grammars for expressions.
Wolfgang J. Paul +3 more
openaire +2 more sources
In this chapter the authors introduce context-free grammars, and they explain grammars for expressions.
Wolfgang J. Paul +3 more
openaire +2 more sources
1997
In chapter 5 we use finite automata for text parsing. As noted, there are rather simple structures (e.g., nested comments) that cannot be parsed with finite automata. There is a more powerful formalism called context-free grammars that is often used when finite automata are not enough.
openaire +2 more sources
In chapter 5 we use finite automata for text parsing. As noted, there are rather simple structures (e.g., nested comments) that cannot be parsed with finite automata. There is a more powerful formalism called context-free grammars that is often used when finite automata are not enough.
openaire +2 more sources
Pullback Grammars Are Context-Free
2008Following earlier work on pullback rewriting, we describe here the notion of graph grammar relevant to our formalism. We then show that pullback grammars are context-free and provide a surprising example, namely the context-free generation of square grids.
Ly, Olivier, Chen, Rui, Bauderon, Michel
openaire +3 more sources