`  == Derivation of relation between gravitational constant and electron wavelength ==  Hi Don, on  you wrote:   ``As noted under Matter-wave quantum, the Planck constant can be derived from the electron mass, light velocity and the gravitational constant. h = 2mc(3Gm)exp 1/3, times(2pi)exp 5/3``  Could you show me shortly how it can be derived so I could save time otherwise wasted onr looking for the derivation. Of course I understand that  but I miss relation between  and .  `