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- Path: sparky!uunet!idacrd!desj@ccr-p.ida.org
- From: desj@ccr-p.ida.org (David desJardins)
- Newsgroups: comp.theory
- Subject: Re: solution or information needed
- Message-ID: <1852@idacrd.UUCP>
- Date: 28 Jan 93 01:01:23 GMT
- References: <1993Jan19.151627.21525@matrix.com> <1jogkfINNhil@mojo.eng.umd.edu>
- Sender: desj@idacrd.UUCP
- Organization: IDA Center for Communications Research, Princeton
- Lines: 19
-
- Charles C. Lin <clin@eng.umd.edu> writes:
- >> The language {ww|w E (0 + 1)*} is
- >> (A) not accepted by any Turing machine
- >> (B) accepted by some Turing machines, but by no pushdown automata
- >> (C) accepted by some pushdown automaton, but not context-free
- >> (D) context-free, but not regular
- >> (E) regular
-
- > I recently took the CS GREs, and questions like this do not seem to
- > be as prevalent. While I won't say the entire test is easy, because
- > it's not, they do seem to have made somewhat more reasonable questions.
-
- Does any other reader of this newsgroup want to defend the proposition
- that this is an "unreasonable" question?? This is about the easiest
- nontrivial question one could pose on the theory of computation; either
- this question is perfectly reasonable, or there is no need for theory,
- and thus for this newsgroup.
-
- David desJardins
-