Return-Path: shosh@irisplot.math.arizona.edu
Date: Fri, 7 Feb 1997 14:23:19 -0700 (MST)
From: Alexander Shoshitaishvili <shosh@math.arizona.edu>
To: rychlik@math.arizona.edu
Subject: file for maple

with(grobner):
Vars:= [u12,u13,u14,u23,u24,u34,v12,v13,v14,v23,v24,v34,e1,e2,e3,e4,h1,h2,h3,
h4,x1,x2,x3,x4,y1,y2,y3,y4];
f12:=1-u12*(x1-x2)-v12*(y1-y2);
f13:=1-u13*(x1-x3)-v13*(y1-y3);
f14:=1-u14*(x1-x4)-v14*(y1-y4);
f23:=1-u23*(x2-x3)-v23*(y2-y3);
f24:=1-u24*(x2-x4)-v24*(y2-y4);
f34:=1-u34*(x3-x4)-v34*(y3-y4);
a1:=x1^2+e1+e2*x1+e3*y1+e4*x1*y1;
a2:=y1^2+h1+h2*x1+h3*y1+h4*x1*y1;
b1:=x2^2+e1+e2*x2+e3*y2+e4*x2*y2;
b2:=y2^2+h1+h2*x2+h3*y2+h4*x2*y2;
c1:=x3^2+e1+e2*x3+e3*y3+e4*x3*y3;
c2:=y3^2+h1+h2*x3+h3*y3+h4*x3*y3;
d1:=x4^2+e1+e2*x4+e3*y4+e4*x4*y4;
d2:=y4^2+h1+h2*x4+h3*y4+h4*x4*y4;
F:=[f12,f13,f14,f23,f24,f34,a1,a2,b1,b2,c1,c2,d1,d2];
Gb:=gbasis(F,Vars,plex);