Singular Manual: module declarations

  | ### 4.12.1 module declarations Syntax: `module` name `=` list_of_vector_expressions `;` `module` name `=` 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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