LIMITEDFACTORS _ _ _ _ _ _ _ _ _ _ _ _ switch

To get limited factorization in cases where it is too expensive to use full multivariate polynomial factorization, the switch limitedfactors can be turned on. In that case, only ``inexpensive'' factoring operations, such as square-free factorization, will be used when factorize is called.

examples:

a := (y-x)^2*(y^3+2x*y+5)*(y^2-3x*y+7)$ 

factorize a; 

              2
  {- 3*X*Y + Y  + 7,1}
            3
  {2*X*Y + Y  + 5,1},
  {X - Y,2}}


on limitedfactors; 

factorize a; 

        2  2        4        3          5      3      2
  {- 6*X *Y  - 3*X*Y  + 2*X*Y  - X*Y + Y  + 7*Y  + 5*Y  + 35,1},
  {X - Y,2}}