Planck<br/>only regards quantization as a skill in mathematical processing,<br/>while Einstein understands quantization as a basic phenomenon, that<br/>is, when light propagates in space, the energy is quantized. (<br/>)

Einstein<br/>only regards quantization as a skill in mathematical processing,<br/>while Planck understands quantization as a basic phenomenon, that is,<br/>when light propagates in space, the energy is quantized. (<br/>)