27 #ifndef G2O_MATH_STUFF    28 #define G2O_MATH_STUFF    31 #include <Eigen/Geometry>    34   using namespace Eigen;
    36   inline Matrix3d 
skew(
const Vector3d&v);
    37   inline Vector3d 
deltaR(
const Matrix3d& R);
    38   inline Vector2d 
project(
const Vector3d&);
    39   inline Vector3d 
project(
const Vector4d&);
    40   inline Vector3d 
unproject(
const Vector2d&);
 Vector3d unproject(const Vector2d &)
Vector3d deltaR(const Matrix3d &R)
Vector2d project(const Vector3d &)
Matrix3d skew(const Vector3d &v)