I am new to this forum! I write here hoping someone can help me.
I have found a statement in my quantum mechanics book that I really don't understand.
We have a system of two electrons. If both are in a singlet state, the orbital part of the wavefunction of the system must be symmetric. Otherwise, if they are both in a triplet state, it must be antisymmetric.
In my previous studies I have seen that a singlet state is antisymmetric, and that a triplet one is symmetric. I know that in this case we have a system of two particles, but how do you explain that?