- where is Planck's constant, also known as Planck's action quantum ( introduced already in 1899 ), and ( the Greek letter " nu ", not the Roman letter v ) is the frequency of the radiation.
- Subsequently, Planck tried to grasp the meaning of energy quanta, but to no avail . " My unavailing attempts to somehow reintegrate the action quantum into classical theory extended over several years and caused me much trouble . " Even several years later, other physicists like Lorentz set Planck's constant to zero in order to align with classical physics, but Planck knew well that this constant had a precise nonzero value . " I am unable to understand Jeans'stubbornness he is an example of a theoretician as should never be existing, the same as Hegel was for philosophy.