it is stressed by E. Faraggi and M. Matone that this does not correspond with the usual quantum potential, as in their approach R exp ⁡ ⁡ ( i S / ℏ ℏ ) is a solution to the Schrödinger equation but does not correspond to the wave function. This has been investigated further by E.R. Floyd for the classical limit ℏ ℏ → → 0 , as well as by Robert Carroll.