|  |  4.13.1 module declarations 
 
Syntax:
modulename=list_of_vector_expressions;
 modulename=module_expression;
Purpose:
defines a module.
Default:
[0]
Example:
|  |   ring r=0,(x,y,z),(c,dp);
  vector s1 = [x2,y3,z];
  vector s2 = [xy,1,0];
  vector s3 = [0,x2-y2,z];
  poly   f  = xyz;
  module m = s1, s2-s1,f*(s3-s1);
  m;
==> m[1]=[x2,y3,z]
==> m[2]=[-x2+xy,-y3+1,-z]
==> m[3]=[-x3yz,-xy4z+x3yz-xy3z]
  // show m in matrix format (columns generate m)
  print(m);
==> x2,-x2+xy,-x3yz,          
==> y3,-y3+1, -xy4z+x3yz-xy3z,
==> z, -z,    0               
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