home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: sci.math
- Path: sparky!uunet!comp.vuw.ac.nz!canterbury.ac.nz!cosc.canterbury.ac.nz!chisnall
- From: chisnall@cosc.canterbury.ac.nz (The Technicolour Throw-up)
- Subject: Re: Erdos number
- Message-ID: <BxyKAK.3r3@cantua.canterbury.ac.nz>
- Nntp-Posting-Host: cantua.canterbury.ac.nz
- Organization: Computer Science,University of Canterbury,New Zealand
- References: <1992Nov12.224157.23146@infodev.cam.ac.uk>
- Date: Thu, 19 Nov 1992 10:11:08 GMT
- Lines: 24
-
- From article <1992Nov12.224157.23146@infodev.cam.ac.uk>, by sl25@cus.cam.ac.uk (Steve Linton):
- > The definition of Erdos number clearly implies the existence of the Erdos
- > graph, in which the number is simply distance from Erdos.
- >
- > 1) observe that this graph is undirected in mathematics, but directed (by
- > the order of the author's names on the paper) in most sciences. Does this
- > allow any interesting generalisations?
-
- Yes. Martin Tompa played around with such ideas (among others) in his paper
- "Figures of merit", SIGACT NEWS, winter 1989, vol 20, #1, pp62-71 and in a
- followup article in vol 21, #4. He uses a modified graph in which there is a
- path from a to b iff a's name occurs before b's does on a paper and then
- defines the "monotonic Erdos number" to be the longest path between Erdos and
- someone! He also looks at a few other metrics.
-
- Interesting to see the name of one of sci.math's frequent posters show up in
- the tables that Tompa uses. Apparently Vaughn Pratt's Erdos number is at
- worst 4.
-
- --
- Just my two rubber ningis worth.
- Name: Michael Chisnall (chisnall@cosc.canterbury.ac.nz)
- I'm not a .signature virus and nor do I play one on tv.
- Will be .signature virus for food.
-