If there is degeneracy U1(x+a)=C1U1(x)+C12U2(x) U2(x+a)=C2U1(x)+C22U2(x) Do we have P(x+a)=(x)? Construct the wavefunction Ψ(x)=AU1(x)+BU2(x) |8c 二0 C12 Ψ1(x+a)=Ψ1(x) Ψ2(x+a)=2Ψ2(x)If there is degeneracy ( ) ( ) ( ) ( ) ( ) ( ) 2 2 1 1 2 2 2 1 1 1 1 1 2 2 U x a C U x C U x U x a C U x C U x       Do we have (x  a)  (x) ? ( ) ( ) ( ) ( ) 2 2 2 1 1 1 x a x x a x           0 1 2 2 2 1 1 2 1      C C C C ( ) ( ) ( ) Construct the wavefunction 1 2  x  AU x  BU x