Related articles |
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Is a contextfree Grammar ambiguous ? mmeyer@rhso.de (Martin Meyer) (1998-10-30) |
Re: Is a contextfree Grammar ambiguous ? clark@quarry.zk3.dec.com (Chris Clark USG) (1998-11-06) |
Re: Is a contextfree Grammar ambiguous ? mickunas@cs.uiuc.edu (1998-11-07) |
Re: Is a contextfree Grammar ambiguous ? mickunas@cs.uiuc.edu (1998-11-07) |
Re: Is a contextfree Grammar ambiguous ? aycock@csc.uvic.ca (1998-11-07) |
Re: Is a contextfree Grammar ambiguous ? dmr@plan9.bell-labs.com (1998-11-07) |
Re: Is a contextfree Grammar ambiguous ? cfc@world.std.com (Chris F Clark) (1998-11-07) |
Re: Is a contextfree Grammar ambiguous ? cfc@world.std.com (Chris F Clark) (1998-11-12) |
Re: Is a contextfree Grammar ambiguous ? jmlake@unity.ncsu.edu (1998-11-15) |
From: | Chris F Clark <cfc@world.std.com> |
Newsgroups: | comp.compilers,comp.theory |
Date: | 7 Nov 1998 01:28:28 -0500 |
Organization: | The World Public Access UNIX, Brookline, MA |
Distribution: | inet |
References: | 98-10-172 98-11-037 |
Keywords: | parse, theory |
My apologies to all for writing incorrectly:
> The semantic nit is that by definition a context free grammar is
> unambiguous. That is, if your grammar is ambiguous it is not a
> context free grammar.
I mispoke. The original question was worded properly. The definition
of context free grammars does not require that they be unambiguous.
In fact, any grammar defined by [E]BNF with one nonterminal on each
LHS is a context free grammar. I had another reason to look up the
definition of context free grammars and realized my error.
Hope this helps,
-Chris
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