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i am puzzled by this problem

- Thread starter wdlang
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i am puzzled by this problem

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alxm

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But for any interacting electrons they can swap spins, so you can never tell which one is or was which.

So they're 'distinguishable' from the thermodynamic sense since the total number of each spin is conserved,

and you have Fermi-Dirac statistics and all that. But they're not distinguishable in the sense that you can tell one from the other.

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Is the correct interpretation to say that the protons are made from 3 quarks, so swapping the two protons swaps 3 quarks (u of one with the u of the other, d of one with d of the other) which produces a negative sign since 3 is an odd number of swaps?

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