Matrix t*K(1) in Subspace 148 with Dimension 3

(K(1) is the first-order Grosse operator)

I*Sqrt[3]*t (U + I*Sqrt[3]*U)/2 ((-3 - I*Sqrt[3])*t)/Sqrt[2]
(I/2)*(I + Sqrt[3])*U (-I)*Sqrt[3]*t ((1 + I*Sqrt[3])*U)/Sqrt[2]
((3 - I*Sqrt[3])*t)/Sqrt[2] (I*(I + Sqrt[3])*U)/Sqrt[2] 0