Top "Language-theory" questions

Regular expression for strings with even number of a's and odd no of b's

Im having a problem in solving the problem:- Its an assignment, i solved it, but it seems to be …

string language-theory regular-language
What is the exact problem with multiple inheritance?

I can see people asking all the time whether multiple inheritance should be included into the next version of C# …

oop multiple-inheritance language-theory
Can all iterative algorithms be expressed recursively?

If not, is there a good counter example that shows an iterative algorithm for which there exists no recursive counterpart? …

programming-languages recursion iteration language-theory
Is HTML a context-free language?

Reading some related questions made me think about the theoretical nature of HTML. I'm not talking about XHTML-like code here. …

html grammar language-theory sgml
Exactly what is the difference between a "closure" and a "block"?

I've found that lots of people use the words closure and block interchangeably. Most of these people can't explain what …

programming-languages computer-science theory language-theory
SLR(1) Parser and epsilon involved

Let's suppose I have the following grammar: S → X X → a | ϵ If that grammar wouldn't have ϵ involved, I would construct …

parsing theory grammar compiler-theory language-theory
The recognizing power of "modern" regexes

What class of languages do real modern regexes actually recognise? Whenever there is an unbounded length capturing group with a …

regex perl theory context-free-grammar language-theory
Are all infinite languages undecidable?

I am wondering are all infinite languages undecidable? They must be right, as the TM trying to decide an infinite …

turing-machines computation-theory language-theory