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- From: img@aisb.ed.ac.uk (Ian Green)
- Newsgroups: sci.logic
- Subject: Re: Programs for simple logic proofs: where are they?
- Message-ID: <IMG.92Nov17114848@hope.aisb.ed.ac.uk>
- Date: 17 Nov 92 11:48:48 GMT
- References: <4804@equinox.unr.edu> <1992Nov16.183210.9769@beaver.cs.washington.edu>
- <PLUMMER.92Nov16180704@nutmeg.cs.swarthmore.edu>
- Sender: news@aisb.ed.ac.uk (Network News Administrator)
- Organization: Department of Artificial Intelligence, University of Edinburgh
- Lines: 60
- In-Reply-To: plummer@cs.swarthmore.edu's message of 16 Nov 92 23:07:04 GMT
-
-
- If you're looking for an interactive system, you might try FOL or
- its derivative, GETFOL. Contact Fausto Giunchiglia, at fausto@irst.it or
- fausto@dist.unige.it for more info. Weyhrauch80 describes FOL.
-
- -ian
-
- @article(Weyhrauch80,
- Author = {Weyhrauch, Richard W.},
- Title = {Prolegomena to a Theory of Mechanized Formal Reasoning},
- Year = {1980},
- Journal = AI,
- Volume = {13},
- Pages = {133--170})
-
- thread:
- On 16 Nov 92 23:07:04 GMT, plummer@cs.swarthmore.edu (David Barker-Plummer) said:
- > In article <1992Nov16.183210.9769@beaver.cs.washington.edu> jon@cs.washington.edu (Jon Jacky) writes:
-
- >JJ> In article <4804@equinox.unr.edu> mjb@dws020.unr.edu (Mike Brown) writes:
- >>I am looking for programs that will do proofs like:
- >> Prove: Q \
- >> 1 P then Q Premis > The problem
- >> 2 P Premis /
- >> 3 Q 1, 2, Modus Ponens > The program's proof
- >>
- >>(The proofs do get more involved)
- >>
- >>Is there a program out there that will do these proofs?
-
- >JJ> I saw two responses to this post, recommending Otter and HOL. I think they
- >JJ> made it clear that they were probably not what Mike Brown was looking for.
- >JJ> The Otter and HOL versions of this very simple proof don't look a whole lot
- >JJ> like Mike's very clear presentation. I've read the book about Otter and
- >JJ> learned/used a little of HOL; they are both powerful research systems, with
- >JJ> all that entails.
-
- >JJ> I think what the original post was asking for was a simple natural
- >JJ> deduction prover for propositional logic, where the problem
- >JJ> statements and proofs look much as they do in a logic textbook.
- >JJ> Do such things exist? The nearest thing I have read about is
- >JJ> "Muffin: A Proof Assistant", a chapter by Richard C. Moore in
- >JJ> Jones and Shaw, CASE STUDIES IN SYSTEMATIC SOFTWARE DEVELOPMENT,
- >JJ> Prentice Hall International, 1990. I recall the chapter saying
- >JJ> something about Muffin being made available. I wonder if anyone
- >JJ> is using it.
-
- > Andrews' system, ack I can't remember its name right now, allws you to
- > construct proofs in exactly the standard natural deduction
- > presentation of the original poster's example. Contact Peter Andrews
- > at CMU. Of course, the underlying logic of this prover is typed
- > higher order logic, and is significantly more powerful (and hence
- > harder to understand) than the simple example would suggest.
-
- > Another system that comes to mind is MacLogic developed by Roy Dychoff
- > at St. Andrews University (rd@cs.st-and.ac.uk). I am not sure of the
- > availability, but this is the sort of system I would choose for
- > teaching natural deduction to neophytes.
-
- > -- Dave
-