qm: 12.1a: done
qm: 12.1b: 1/2 first order energies
qm: 12.1b: almost done
qm: 12.1b: done
qm: 12.1b: fixed
qm: 12.1c: done
qm: 12.1b: corrected (Prof. Eisert was wrong)
qm: 12.3a: done
qm: 12.3b: done
qm: 12.3b: de-uglified typesetting
qm: 12.3c: done
qm: 12.2: some bullshit to maybe get points