Elementary Particles Follow Their Own Laws
Einstein to Erwin Schrödinger, 28 February 1925, reproduction

Using a diagram, Einstein explains to Schrödinger the new statistics of quantum theory. The question is: How many ways can two particles be distributed between two cells? The classical answer is four, but according to Bose-Einstein statistics there are only three: The two classical possibilities of one particle is left and the other is right are only one in terms of quantum mechanics, because the particles cannot be distinguished from each other.

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