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  • Members: 191
  • Category: Mathematics
  • Founded: May 21, 2001
  • Language: English
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Minkowski reduced lattices   Message List  
Reply Message #1437 of 20696 |
Re: Minkowski reduced lattices

--- In tuning-math@y..., genewardsmith@j... wrote:
> --- In tuning-math@y..., genewardsmith@j... wrote:
>
> > I'll get back to you if I can find this conjecture you speak of.
>
> I think you either need to find a better keyboard

Done. The thinking goes as follows. The "length" of a unison vector
n/d, n~=d, in the Tenney lattice with taxicab metric, or van Prooijen
lattice with triangular-taxicab metric, is proportional to log(n) +
log(d) (hence approx. proportional to log(d)), and also to
the "number" (in some weighted sense) of consonant intervals making
up that unison vector. Thus, in order to temper this unison vector
out (assuming that other UVs being tempered out, if any, are
orthogonal to this one), one must temper each consonant interval
involved by an "average" amount proportional to w/log(d), where w is
the musical width of the unison vector.

w=log(n/d)
w~=n/d-1
w~=(n-d)/d

Hence the amount of tempering implied by the unison vector is approx.
proportional to

(n-d)/(d*log(d))

Yes?




Mon Nov 19, 2001 9:39 pm

paulerlich
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Message #1437 of 20696 |
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The classic Minkowski reduced lattice definition in the case of a two- dimensional lattice reduces to saying that one basis element is as short as possible,...
genewardsmith@...
ideaofgod Offline Send Email
Nov 18, 2001
10:31 am

... two- ... Minkowski reduced basis . . . it it unique?...
Paul Erlich
paulerlich Offline Send Email
Nov 19, 2001
3:35 am

... Yes, that's basically why I brought it up. I think usually the LLL- reduced basis in the 7-limit will also be Minkowski reduced, but if it isn't it would...
genewardsmith@...
ideaofgod Offline Send Email
Nov 19, 2001
3:52 am

... On the Tenney lattice with a taxicab metric? ... wanted ... I'll have to think hard about this. For now, does the conjecture I've posted about the...
Paul Erlich
paulerlich Offline Send Email
Nov 19, 2001
4:36 am

... LLL- ... I think so--we are talking about only two vectors, after all, and a Euclidean distance adjusted to be as much like Tenney as possible. I'll get...
genewardsmith@...
ideaofgod Offline Send Email
Nov 19, 2001
6:24 am

... I think you either need to find a better keyboard, or give me an article number....
genewardsmith@...
ideaofgod Offline Send Email
Nov 19, 2001
7:09 am

... Done. The thinking goes as follows. The "length" of a unison vector n/d, n~=d, in the Tenney lattice with taxicab metric, or van Prooijen lattice with...
Paul Erlich
paulerlich Offline Send Email
Nov 19, 2001
9:39 pm

... Sounds reasonable. Is this a conjecture, and observation or a heuristic argument? If it's a conjecture it needs to be stated more precisely....
genewardsmith@...
ideaofgod Offline Send Email
Nov 19, 2001
11:44 pm

... Heuristic argument. If it can be made more precise I'd be most grateful to whoever does so....
Paul Erlich
paulerlich Offline Send Email
Nov 19, 2001
11:47 pm
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