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## Main Question or Discussion Point

Obviously because there is a minus sign in |0 0> = 1/sqrt(2)*((up)(down)-(down)(up)) but I guess I am not completely sure why |0 0> can't equal 1/sqrt(2)*((up)(down)+(down)(up))...

m still equals zero, and aren't we pretty much arbitrarily deciding that the spins are oppositely aligned in the singlet configuration? (I am thinking that that is what the minus sign has to represent said opposite alignment, but don't know how to justify that...)

Sorry for such a basic question!

m still equals zero, and aren't we pretty much arbitrarily deciding that the spins are oppositely aligned in the singlet configuration? (I am thinking that that is what the minus sign has to represent said opposite alignment, but don't know how to justify that...)

Sorry for such a basic question!