User talk:Joris.deguet

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Hello, Joris.deguet, and welcome to Wikipedia! Thank you for your contributions. I hope you like the place and decide to stay. Here are some pages that you might find helpful:

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[edit] Ambiguous grammar

Hello, I removed the fact template.

Hopcroft, Ullman in "Introduction to Automata Theory, Languages and Computation" write: "It is not decidable to determine given any context-free grammar whether it is ambiguous or not" (this is not an exact quote - my translation from Polish; chapter "Undecidability", section "Post correspondence problem")

Best, 212.87.13.71 (talk) 19:36, 12 May 2008 (UTC)