e_lehman@... wrote:
> I did a pretty close study of satisfiability algorithms last fall, so
> I'm reasonably up on that topic. I think I have a simple algorithm
> for 3-SAT that probably beats the best known, but the analysis looks
> hairy. There is some question whether improving the run time from
> 1.334^n to 1.295^n (or whatever) is really interesting anyway.
From a theoretical point of view, I agree.
In another way, the algorithms are often tested on benchmarks,
randomly generated or coming from real world problem (planning,
model checking, etc.)
You can find such benchmarks at: http://www.satlib.org/
And you may subscribe to SAT Live! if the satisfiability
problem interests you ;-=) http://www.satlive.org/
I am looking forward reading your work on the subject,
Daniel
--
Daniel Le Berre http://cafe.newcastle.edu.au/daniel/
Research Associate, mailto:daniel@...
School Of Management, S123, University of Newcastle, NSW 2308
Australia Tel: (02) 4921 {5009(Off), 7055(Lab.), 6911(Fax)}
Okay, I'll do the introduction thing, too... My best research is in the area of generating high-performance circuits that compute a given boolean function....
e_lehman@...
Feb 7, 2001 7:13 am
Hi Eric, ... From a theoretical point of view, I agree. In another way, the algorithms are often tested on benchmarks, randomly generated or coming from real...
Daniel Le Berre
daniel@...
Feb 7, 2001 7:24 am
Danel-- Thank you for the links! Anatoly-- $100 that no P = NP proof will appear in a major, refereed journal. (Science, Nature, Journal of the ACM, ...) ...
e_lehman@...
Feb 9, 2001 4:46 pm
Hello Eric, ... A little... :) Well. However, I suppose your prize will be winned if YOU do not be able to refute a result. I hope you entrust to own...
Anatoly D. Plotnikov
aplot@...
Feb 9, 2001 5:56 pm
... How about PSpace != P? Can I get some action? ... Twiddle uses a similar technique: Before choosing a variable at the Davis-Putnam split step, try each ...
Dan Pehoushek
danpehous@...
Feb 9, 2001 6:09 pm
In a message dated 2/9/01 1:12:22 PM Eastern Standard Time, danpehous@... writes: << Subj: Re: [algorithm-forge] Re: hi + SAT stuff Date: 2/9/01...
chvol@...
Feb 9, 2001 7:31 pm
hi all.. I can see maybe this new list will work great as a place to "let our hair down". I like mini science essays over on T-E and it is surely not always...
vznuri@...
Feb 9, 2001 8:48 pm
... vlad! you shouldn't say that before you retrieve his honor. M.N....
Michiro Nasu
nasukun@...
Feb 9, 2001 9:11 pm
hey TM that is a really beautiful summary/survey, it really gets my neurons going, thanks so much. here's something for everyone elses neurons.. could the...
vznuri@...
Jun 22, 2001 6:49 pm
Hi guys, ... I may not have understood everything about this notion, but in two words, the backbone of a formula is the set of literals implied by the formula....
Daniel Le Berre
daniel@...
Feb 9, 2001 9:21 pm
... DPLL stands for Davis, Logeman and Loveland, aka the paper published in 1962 replacing the directed resolution found in the original paper published by...
Daniel Le Berre
daniel@...
Feb 9, 2001 9:30 pm
... I started using the try-all-variables technique in the late 1980's (88 or 89), at Stanford. It gave some promising results. Alas, I have been unable to...
Dan Pehoushek
danpehous@...
Feb 10, 2001 2:45 pm
Addendum regarding enhancements. Beyond connected components, and try-all-variables at the choice of split-var, I said I was unable to find any enhancements....
Dan Pehoushek
danpehous@...
Feb 10, 2001 3:12 pm
DP-- I was reading a recent survey paper on logic theory, including things like "1st order logic" etc. .. the author had some amazing relations between e.g....
vznuri@...
Feb 11, 2001 12:45 am
... Iso and homo morphisms between different forms of mathematical machinery should not be too unexpected anymore. ... Yes, #P=#Q does have analogs and...
Dan Pehoushek
danpehous@...
Feb 11, 2001 3:38 pm
... I found references to the following papers (haven't seen them), they might be interesting for you: 80b:68050 68C25 Aspvall, Bengt; Plass, Michael F.;...
Marx Dániel
dmarx@...
Feb 12, 2001 8:23 pm
... Boolean formulas. ... fully quantified Boolean formula that has the quantified part in ... algorithm runs in time $O(n+m)$, where $n$ is the number of ... ...
Tom Morrisette
Thomas.Morrisette@...
Feb 12, 2001 9:22 pm
hi TM did you summarize the approach that shows 2Sat is in P over on T-E once, iirc? do you have a ref? did it involve tarjan's ideas or was that something...
vznuri@...
Feb 13, 2001 7:56 pm
... I'm certain I did, yes. But I don't recall precisely when. ... yes, see the two refs in the note you just replied to. :) They both refer back to the...
Tom Morrisette
Thomas.Morrisette@...
Feb 13, 2001 8:42 pm
hi TM .. thanks to the ref to your 2sat article via online email, I dont see why it doesnt deserve posting again ...
vznuri@...
Feb 14, 2001 12:44 am
... You are welcome ... No problem ... According to my vague recollection, the quantification discussion is a good example to emulate in proofs of Dan's result...
Tom Morrisette
Thomas.Morrisette@...
Feb 14, 2001 7:43 pm
... Boolean formulas. ... a fully quantified Boolean formula that has the quantified part in ... algorithm runs in time $O(n+m)$, where $n$ is the number of ...
danpehous@...
Feb 13, 2001 1:21 am
Hi, Vladimir and Tom! ... http://www.geocities.com/st_busygin/sat01_notes.html and http://www.busygin.dp.ua/npc.html Vladimir is right - the method using...
Stas Busygin
busygin@...
Feb 13, 2001 10:44 pm
Hi Stas. Thanks for forming this list. EL: Can you give a reference for the Schoning stuff. It seems very interesting. --Bob Solovay ... assignment to the n...
solovay@...
Feb 9, 2001 10:45 pm
... I couldn't find Dr. Schoning's home page or anything downloadable, but here is the reference Schoning, U, "A probabilistic algorithm for k-SAT and...
Thomas.Morrisette@...
Feb 10, 2001 12:01 am
On Sat, Feb 10, 2001 at 12:01:03AM -0000, Thomas.Morrisette@... wrote: [···] ... [···] Well, he does have something resembling a home page: ...
Niklas Matthies
matthies@...
Feb 10, 2001 12:46 am
Since everyone has been giving an introduction on their interests, I will follow suit. However, my main interests are currently not in CS/algorithms at all. I ...
Lasse
lrempe@...
Feb 10, 2001 6:01 pm
... I think someone else posted the reference. I've put a short postscript summary that I wrote in another context in the files area. It also discusses the...
e_lehman@...
Feb 10, 2001 1:58 am
... Here is an online article that cites Schoning's result: An Improved Exponential-time Algorithm for k-SAT by Ramamohan Paturi Pavel Pudlak Michael E Saks ...
Thomas.Morrisette@...
Feb 10, 2001 2:23 am
... Evidently Schoning's analysis was loose in the preprint. In the final version, he got (4/3)^n and not (3/2)^n as stated above. In fact, it is easy to...