Date: Jan 31, 2005 9:38 PM
Author: Robert Israel
Subject: Re: Simplex question I don't know the meaning of

In article <1107216986.532167.213090@z14g2000cwz.googlegroups.com>,
 <axe@cam.org> wrote:
>I'm told the angle formed by joining the centre of an n-simplex to
>any two vertices is acos (-1/n). Does this mean that for a geometer
>living in n+1 dimensions the angle acos (-1/n) is ruler-and-compass
>constructible?

I don't know any geometers living in n+1 dimensions (for n <> 2), but
that angle certainly is constructible, without needing more than 2 
dimensions.  Hint: construct a triangle...

Robert Israel                                israel@math.ubc.ca
Department of Mathematics        http://www.math.ubc.ca/~israel 
University of British Columbia            Vancouver, BC, Canada