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Newsgroups: sci.math
From: William Elliot <ma...@hevanet.remove.com>
Date: Wed, 29 Aug 2007 20:35:58 -0700
Local: Wed, Aug 29 2007 5:35 pm
Subject: Re: Tetra-Lattices
On Wed, 29 Aug 2007, PaulHjelmstad wrote: Don't know. > http://www.neverendingbooks.org/ > 1. Please explain what a vector of norm 4 and norm 8 are > (Here he gives +-(3,-1,-1,-1) as norm 4 and +-(1,3,1,-1_ 9 + 1 + 1 + 1 = 12; 1 + 9 + 1 + 1 = 12. > as norm 8, also +-(-3,-1,-1,-1) as norm 4 and +-(1,-3,1,-1) as norm 8 All four have length = sqr 12. > 2. Don't see why the inproduct of (3,-1,-1,-1).(1,3,1,-1) = -1 and Those dot * products are both 0. > (-3,-1,-1,-1).(1,-3,1,-1) =2 What's an inproduct? Anything like an end product? > 3. The squared lengths of the vectors are 1/12, 7/12, 13/12 and 19/12, What vectors? > how are these obtained (dot product?) Obviously these are not even. The length of a vector v is |v| = sqr v*v. > Please see the link.. No, I'm not going to search through the site to find what vectors you are considering. You must Sign in before you can post messages.
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