ch.input

--Copyright The Numerical Algorithms Group Limited 1991.
--Cyclohexan
 
mfzn : SQMATRIX(6,DMP([x,y,z],Fraction INT)) :=_
  [[0,1,1,1,1,1],[1,0,1,8/3,x,8/3],[1,1,0,1,8/3,y],_
   [1,8/3,1,0,1,8/3],[1,x,8/3,1,0,1],[1,8/3,y,8/3,1,0]]
fzn := determinant mfzn
mfxn : SQMATRIX(6,DMP([x,y,z],Fraction Integer)) :=_
  [[0,1,1,1,1,1],[1,0,1,8/3,y,8/3],[1,1,0,1,8/3,z],_
   [1,8/3,1,0,1,8/3],[1,y,8/3,1,0,1],[1,8/3,z,8/3,1,0]]
fxn := determinant mfxn
mfyn : SQMATRIX(6,DMP([x,y,z],Fraction Integer)) :=_
  [[0,1,1,1,1,1],[1,0,1,8/3,z,8/3],[1,1,0,1,8/3,x],_
   [1,8/3,1,0,1,8/3],[1,z,8/3,1,0,1],[1,8/3,x,8/3,1,0]]
fyn := determinant mfyn
gb := groebnerFactorize [fxn,fyn,fzn]