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hardy@umnstat.stat.umn.edu (Michael Hardy) writes:
>	One of the authors was Sir Harold Jeffreys, a professor of
>_astronomy_.  
The other, incidentally, was his wife, Bertha Jeffreys.
They married when Harold Jeffreys was "past the first bloom of youth";
I read somewhere that they were brought together by scheming romantics,
and lived very happily ever after.
She was a well-known mathematician in her own right,
being a Fellow and Mathematical Tutor in Girton,
in the good old days when Girton was a single-sex institution.
-- 
Timothy Murphy  
e-mail: tim@maths.tcd.ie
tel: +353-1-2842366
s-mail: School of Mathematics, Trinity College, Dublin 2, Ireland

Hi, my friends.  I am seeking information on Double Description Algorithm 
for convex polyhedral cones (or convex polyhedron).  A convex polyhedral 
cone can be expressed either as the span of its extreme edges or as the 
intersection of its boundary hyperplanes.  A double description algorithm 
performs convertion between these two forms.  Could anyone recommend a 
paper/book/reference for me to learn the status of research on this 
algorithm? Any advice, insight?  Thank you very much.
Peter X. Chen
Private reply to xinc@hotmail.com

SDQN55A@prodigy.com (Qin He) writes:
>paper/book/reference for me to learn the status of research on this 
>algorithm? Any advice, insight?  Thank you very much.
For instance, the book of G.Ziegler "Lectures on Polytopes", Springer,
Grad. Texts Math.
For implementations (there are few available), check e.g.
ftp://ftp.zib.de/pub/mathprog/polyth/index.html
>Peter X. Chen
>Private reply to xinc@hotmail.com
Cheers,
Dmitrii.
Dmitrii V. Pasechnik
Department of Mathematics
Eindhoven University of Technology
PO Box 513, 5600 MB Eindhoven
The Netherlands
e-mail: dima@win.tue.nl
http://www.can.nl/~pasec

The Logic Team and Functional Analysis Team of the University of 
Mons-Hainaut (Belgium) will organize an international meeting
about Analysis and Logic on August 24-29 1997.
You may find the first announcement on
http://sun1.umh.ac.be/~boffa/analog.htm
Arnaud Maes
maesa@sun1.umh.ac.be

In article <5apjb9$kg6@graves.maths.tcd.ie>,
Timothy Murphy   wrote:
>hardy@umnstat.stat.umn.edu (Michael Hardy) writes:
>
>>	One of the authors was Sir Harold Jeffreys
>
>The other, incidentally, was his wife, Bertha Jeffreys.
>They married when Harold Jeffreys was "past the first bloom of youth";
>I read somewhere that they were brought together by scheming romantics,
>and lived very happily ever after.
Before their marriage she was a student of his.
>She was a well-known mathematician in her own right,
Was? Is, I hope. When I last saw her about a year ago she was alive and 
well, in her early 90s, and had recently been awarded an honorary 
doctorate by the University of Saskatchewan. 
John Harper School of Math+Comp Sci Victoria Univ Wellington New Zealand