Boulware-Deser ghost in extended quasidilaton massive gravity
  In the extended quasidilaton massive gravity we perform a nonlinear
transformation of the shift vector and then calculate the second derivatives of
the Hamiltonian density with respect to the lapse function and the (nonlinearly
transformed) shift vector. It is then shown that the $4\times 4$ Hessian matrix
is invertible, meaning that the equations of motion for the lapse function and
the shift vector simply determine themselves. Therefore, there is no primary
constraint that removes the Boulware-Deser ghost.
