1. The problem statement, all variables and given/known data two identical particles of spin 1/2 that confined in a cubical box of side L. find the energy and wave function (non-interacting between particles) 2. Relevant equations for a cubic boxby and reducing the Schrodinger equation: ψ(x,y,z)=√(8/L3 ) sin((nx πx)/L)sin((ny πy)/L)sin((nz πz)/L) E= (ħ2 π2)/(2mL2 ) (nx2+ny2+nz2 ) 3. The attempt at a solution E=ε1+ε2=(ħ2 π2)/(2mL2 ) [(n_x12+n_y12+n_z12 )+(n_x22+n_y22+n_z22 ) ] n how about the wave function? should i find it anti-symmetry wave funtion？ ψa(r1,r2;S1,S2)=ψs(r1,r2)χa(S1,S2) =ψa(r1,r2)χs(S1,S2) then the wave function is combination of this?