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Import the second public release of PHCpack.

OKed by Jan Verschelde.

with Standard_Complex_Polynomials;       use Standard_Complex_Polynomials;
with Standard_Complex_Poly_Systems;      use Standard_Complex_Poly_Systems;
with Standard_Complex_Solutions;         use Standard_Complex_Solutions;

package Projective_Transformations is

-- DESCRIPTION :
--   This package provides routines for performing a projective
--   transformation on polynomials and polynomial systems, on
--   solutions and on lists of solutions.

  function Projective_Transformation ( p : Poly ) return Poly;
  function Projective_Transformation ( p : Poly_Sys ) return Poly_Sys;

  procedure Projective_Transformation ( p : in out Poly );
  procedure Projective_Transformation ( p : in out Poly_Sys );

  -- DESCRIPTION :
  --   An additional unknown is added so that each term has the same degree.

  function Projective_Transformation ( s : Solution ) return Solution;

  -- DESCRIPTION :
  --   Adds 1 as last component to the solution.

  function Projective_Transformation
             ( sols : Solution_List ) return Solution_List;
  procedure Projective_Transformation ( sols : in out Solution_List );

  -- DESCRIPTION :
  --   An additional component, equal to 1, is added to the solution vector.

  function  Affine_Transformation ( s : Solution ) return Solution;
  procedure Affine_Transformation ( sols : in out Solution_List );

  -- DESCRIPTION :
  --   All components of the solution vector will be divided by the last
  --   component, which is afterwards cut off.

end Projective_Transformations;