Abstract
I HOPED that my first letter on this subject would draw from some mathematician a statement on the uniqueness of the condition mentioned therein, and I am grateful to Mr. Kendall for responding and also for his kindness in sending me an early copy of his letter. From the physical point of view the position remains, I think, as stated in my second letter. The thermal relativity theory requires that the radiation formula shall satisfy a certain condition, which in fact it does. The theory is thus to that extent supported. The condition, however, is much less restrictive than I at first thought possible, and does not itself demand the Planck formula.
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