Abstract
IT is known that on different occasions and in different forms a dimensionless constant of the order of between 1039 and 1040 recurs in physics—the variety being due to the fact that two other dimensionless combinations (hc/e2 and mp/me) are comparatively small and, besides, are of the same order (103). Some of us believe that the large constant is the square root of the number of mass-units (protons and neutrons) in the world (N). I propose to name Eddington's relation the relationship between universal constants which springs from this assumption. For it is essentially one and we need a name for it, in order to be able to say, this is essentially Eddington's relation, when we are presented with a disguised form of it.
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