On 2013-02-01, J.B. Wood <email@example.com> wrote: > On 01/26/2013 11:09 AM, Mike Terry wrote:
>> I'd never heard of the permanent before, but checking Wickipedia it seems >> it's defined just like the determinant, but with all plus signs. So in your >> example:
> Hello, and that's the problem with folks who rely solely on Wiki for > info. Someone invents a term that's not in common usage or in > peer-reviewed papers or textbooks, posts it on Wiki, and everyone thinks > it's been around since the time of Greek mathematicians. Sometimes you > just gotta get up off your butt and go to the public/university library > or dust off one of your college math textbooks (assuming you kept them). > Sincerely,
Matrix permanent has been around a lot longer than that; I do not know who invented it.
Unfortunately, it is not as easy to compute as the determinant, and it does not seem to have any geometric meaning, as the determinant has. Its computation is known to be NP complete.
-- This address is for information only. I do not claim that these views are those of the Statistics Department or of Purdue University. Herman Rubin, Department of Statistics, Purdue University firstname.lastname@example.org Phone: (765)494-6054 FAX: (765)494-0558