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| Do you mean like this: f[B_] := {\[Lambda]1, \[Lambda]2, \[Lambda]3} = Eigenvalues[ h*D1*(Sz)^2 + g*\[Mu]B*B*Cos [\[Alpha]]*Sz/h + g*\[Mu]B*(Sqrt[B^2 - (B*Cos [\[Alpha]])^2]*Sx + By*Sy)/h + h*E1*(Sx.Sx -... |