User bkkbrad - MathOverflow most recent 30 from http://mathoverflow.net 2013-05-24T04:28:19Z http://mathoverflow.net/feeds/user/2836 http://www.creativecommons.org/licenses/by-nc/2.5/rdf http://mathoverflow.net/questions/9898/notation-for-the-all-ones-vector Notation for the all-ones vector Bkkbrad 2009-12-27T21:14:53Z 2009-12-28T16:33:56Z <p>What's the most common way of writing the all-ones vector, that is, the vector, when projected onto each standard basis vector of a given vector space, having length one? The zero vector is frequently written $\vec{0}$, so I'm partial to writing the all-ones vector as $\vec{1}$, but I don't know how popular this is, and I don't know if a reader might confuse it with the identity matrix.</p> <p>I'm writing for a graph theory audience, if that helps pick a notation.</p> http://mathoverflow.net/questions/9898/notation-for-the-all-ones-vector/9902#9902 Comment by Bkkbrad Bkkbrad 2009-12-27T23:23:27Z 2009-12-27T23:23:27Z As much as I love the bold <b>1</b> notation, I think I will go with the bold <b>e</b>, since that appears popular in the papers I am citing. http://mathoverflow.net/questions/9898/notation-for-the-all-ones-vector Comment by Bkkbrad Bkkbrad 2009-12-27T21:41:12Z 2009-12-27T21:41:12Z @Jonas: Absolutely right; the specific vector space I refer to in my paper has a natural correspondence between basis vectors and indexed vertices of a finite graph.