How to deduce Einstein's mass energy equation? Is it reasonable to deduce e = HF = H / (C / in) = H / (C / (H / MV)) = MC2 according to Planck's photon energy formula? I think about it myself,

How to deduce Einstein's mass energy equation? Is it reasonable to deduce e = HF = H / (C / in) = H / (C / (H / MV)) = MC2 according to Planck's photon energy formula? I think about it myself,

The derivation of this formula is correct, but Einstein did not deduce it in this way. In order to derive this formula, you must first accept two assumptions of special relativity: 1. The velocity of spherical light emitted by any light source is isotropic in all inertial reference frames, and it is always C 2. The physical laws in all inertial reference frames are the same