“…It is well known that there are always two and −1 transformations successively, also by the stable (or unstable) manifold theorem in [15], to straighten the local manifolds loc and loc as loc = { ∈ , = = 0} and loc = { ∈ , = V = 0}, respectively, loc = { ∈ , = = = 0} (resp., loc = { ∈ , = = V = 0}); see [8][9][10]. Notice that now Γ ∩ loc = { ∈ , = ( ), = V = 0} and Γ ∩ loc = loc , where = ( , , , V) ∈ R 4 and (0) = (0) = 0.…”