... well as L.I. Schiff, Quantum Mechanics”, McGraw Hill (1968).24 Of course, there are plenty of unstable positions of the chair with respect to the floor. The stationarystates of the chair have more ... are no more stable states of the chair24and there are only four energy levels,Fig. 2.6. The stable states of the chair are analogues to the stationary quantum states of Fig. 1.8.b,d, on p. 23, ... unstable states of the chair on the floor areanalogues of the non-stationary states of Fig. 1.8.a,c.2.2.4 MATHEMATICAL AND PHYSICAL SOLUTIONSIt is worth noting that not all solutions of the Schrödinger...