Since the Schrödinger equation is [[Linear equations|linear]], if <math>\psi_1 (x)</math> and <math>\psi_2 (x)</math> are solutions, then <math>\psi_1 (x) + \psi_2 (x)</math> is also a solution. | Since the Schrödinger equation is [[Linear equations|linear]], if <math>\psi_1 (x)</math> and <math>\psi_2 (x)</math> are solutions, then <math>\psi_1 (x) + \psi_2 (x)</math> is also a solution. |