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Results tagged with context-free
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user 105873
Questions about the set of languages (equivalently) described by context-free grammars or accepted by (non-deterministic) pushdown automata.
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Are there any formal grammars describing the set of all directed graphs?
Let GRAPHS be the set of all directed graphs.
Is there a set of strings STRYNGS such that there exists a bijection between
GRAPHS and STRYNGS?
The canonical definition of directed graph …
1
vote
1
answer
70
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Can You List the Names of Some Algorithms For Determining the Intersection of Two Context Fr...
Suppose we have two sets of strings XS and YS such that set XS is described by grammar GX and YS is described by grammar GY.
We want an algorithm which accepts GX and Gy as inputs. The algorithm will …
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answer
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How can we escape the pipe character in Backus–Naur Normal Form?
Suppose that you were writing down the syntax rules for something like C++ as a context-free grammar in Backus–Naur Normal Form
How can you distinguish between the pipe character as symbol in C++ or a …
2
votes
1
answer
169
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What role does an asterisk serve in Backus–Naur Normal Form?
Suppose that you were reading some production rules for a context-free grammar in Backus–Naur Normal Form
What does the asterisk (*) mean?
In the example below, what is the difference between <fun-def …