Matrix t2*K(2) in Subspace 102 with Dimension 16

(K(2) is the second-order Grosse operator)

(-21*t*U)/4 (-I/4)*Sqrt[3]*U^2 ((-I/4)*(-3*I + Sqrt[3])*U^2)/Sqrt[2] 0 0 (3*(I + Sqrt[3])*t*U)/(2*Sqrt[2]) 0 ((-3*I + Sqrt[3])*t*U)/(4*Sqrt[2]) 0 0 0 (3*(I + Sqrt[3])*t*U)/(4*Sqrt[2]) -(Sqrt[3]*t*U) ((-3*I)/4)*U^2 (-3*(I + Sqrt[3])*U^2)/(4*Sqrt[2]) ((3*I)/4)*t*U
(I/4)*Sqrt[3]*U^2 (-21*t*U)/4 (3*(1 - I*Sqrt[3])*t*U)/(4*Sqrt[2]) 0 0 0 (Sqrt[3/2]*t*U)/2 0 -((3*I + Sqrt[3])*t*U)/(4*Sqrt[2]) 0 -(Sqrt[3/2]*t*U)/2 0 0 (-7*Sqrt[3]*t*U)/4 -((-3*I + Sqrt[3])*t*U)/(4*Sqrt[2]) (Sqrt[3]*U^2)/4
((I/4)*(3*I + Sqrt[3])*U^2)/Sqrt[2] (3*(1 + I*Sqrt[3])*t*U)/(4*Sqrt[2]) -6*t*U 0 0 0 0 0 0 -(((-3*I + Sqrt[3])*t^2)/Sqrt[2]) 0 0 (-3*(-I + Sqrt[3])*t^2)/Sqrt[2] -((3*I + Sqrt[3])*t*U)/(4*Sqrt[2]) -(Sqrt[3]*t*U) -((3*I + Sqrt[3])*U^2)/(4*Sqrt[2])
0 0 0 -4*t*U ((1 - I*Sqrt[3])*t*U)/Sqrt[2] 0 (t*(Sqrt[2]*U + I*Sqrt[6]*U))/4 0 (I*(2*I + Sqrt[3])*t*U)/Sqrt[2] 0 ((2 + I*Sqrt[3])*t*U)/Sqrt[2] 0 0 0 0 0
0 0 0 ((1 + I*Sqrt[3])*t*U)/Sqrt[2] -7*t*U 0 0 0 -(t*U) 2*Sqrt[2]*t^2 (I/2)*(I + Sqrt[3])*t*U 0 Sqrt[2]*(3 + I*Sqrt[3])*t^2 0 0 0
(3*(-I + Sqrt[3])*t*U)/(2*Sqrt[2]) 0 0 0 0 (-11*t*U)/2 (-I/4)*(-I + Sqrt[3])*U^2 0 -2*t^2 ((I/2)*(I + Sqrt[3])*t*U)/Sqrt[2] 2*t^2 t*U 0 (Sqrt[2] + I*Sqrt[6])*t^2 0 (t*(Sqrt[2]*U + I*Sqrt[6]*U))/4
0 (Sqrt[3/2]*t*U)/2 0 (t*(Sqrt[2]*U - I*Sqrt[6]*U))/4 0 (I/4)*(I + Sqrt[3])*U^2 -5*t*U 0 ((-1 + (3*I)*Sqrt[3])*t*U)/4 0 ((2 - I*Sqrt[3])*t*U)/2 0 0 (3*t*U)/(2*Sqrt[2]) t*(U - I*Sqrt[3]*U) 0
((3*I + Sqrt[3])*t*U)/(4*Sqrt[2]) 0 0 0 0 0 0 -6*t*U ((1 + I*Sqrt[3])*U^2)/4 ((3 + I*Sqrt[3])*t*U)/Sqrt[2] ((1 - I*Sqrt[3])*U^2)/4 (I/2)*Sqrt[3]*t*U 0 0 0 ((3 - I*Sqrt[3])*t*U)/(4*Sqrt[2])
0 -((-3*I + Sqrt[3])*t*U)/(4*Sqrt[2]) 0 ((-2 - I*Sqrt[3])*t*U)/Sqrt[2] -(t*U) -2*t^2 -(t*(U + (3*I)*Sqrt[3]*U))/4 ((1 - I*Sqrt[3])*U^2)/4 -5*t*U -(U^2/Sqrt[2]) ((-1 + (5*I)*Sqrt[3])*t*U)/4 (8*t^2 + U^2 + I*Sqrt[3]*U^2)/4 U^2/Sqrt[2] (((3*I)/4)*(I + Sqrt[3])*t*U)/Sqrt[2] -(t*U) (Sqrt[2] + I*Sqrt[6])*t^2
0 0 -(((3*I + Sqrt[3])*t^2)/Sqrt[2]) 0 2*Sqrt[2]*t^2 ((-I/2)*(-I + Sqrt[3])*t*U)/Sqrt[2] 0 ((3 - I*Sqrt[3])*t*U)/Sqrt[2] -(U^2/Sqrt[2]) -4*t*U ((I/2)*(I + Sqrt[3])*U^2)/Sqrt[2] 0 0 0 ((1 + I*Sqrt[3])*t^2)/Sqrt[2] 0
0 -(Sqrt[3/2]*t*U)/2 0 ((2 - I*Sqrt[3])*t*U)/Sqrt[2] -(t*(U + I*Sqrt[3]*U))/2 2*t^2 ((2 + I*Sqrt[3])*t*U)/2 ((1 + I*Sqrt[3])*U^2)/4 -(t*(U + (5*I)*Sqrt[3]*U))/4 ((-I/2)*(-I + Sqrt[3])*U^2)/Sqrt[2] -5*t*U (-8*t^2 - U^2 + I*Sqrt[3]*U^2)/4 ((I/2)*(I + Sqrt[3])*U^2)/Sqrt[2] (-3*t*U)/(2*Sqrt[2]) t*U (-Sqrt[2] - I*Sqrt[6])*t^2
(3*(-I + Sqrt[3])*t*U)/(4*Sqrt[2]) 0 0 0 0 t*U 0 (-I/2)*Sqrt[3]*t*U (8*t^2 + U^2 - I*Sqrt[3]*U^2)/4 0 (-8*t^2 - U^2 - I*Sqrt[3]*U^2)/4 -7*t*U (((3*I)/2)*(3*I + Sqrt[3])*t*U)/Sqrt[2] (-Sqrt[2] - I*Sqrt[6])*t^2 0 (t*(Sqrt[2]*U + I*Sqrt[6]*U))/8
-(Sqrt[3]*t*U) 0 (-3*(I + Sqrt[3])*t^2)/Sqrt[2] 0 Sqrt[2]*(3 - I*Sqrt[3])*t^2 0 0 0 U^2/Sqrt[2] 0 ((-I/2)*(-I + Sqrt[3])*U^2)/Sqrt[2] (((-3*I)/2)*(-3*I + Sqrt[3])*t*U)/Sqrt[2] -6*t*U 0 ((3 + I*Sqrt[3])*t^2)/Sqrt[2] 0
((3*I)/4)*U^2 (-7*Sqrt[3]*t*U)/4 -((-3*I + Sqrt[3])*t*U)/(4*Sqrt[2]) 0 0 (Sqrt[2] - I*Sqrt[6])*t^2 (3*t*U)/(2*Sqrt[2]) 0 (((-3*I)/4)*(-I + Sqrt[3])*t*U)/Sqrt[2] 0 (-3*t*U)/(2*Sqrt[2]) I*Sqrt[2]*(I + Sqrt[3])*t^2 0 (-27*t*U)/4 (5*(1 - I*Sqrt[3])*t*U)/(4*Sqrt[2]) t^2*(-4 - U^2/(4*t^2))
(-3*(-I + Sqrt[3])*U^2)/(4*Sqrt[2]) -((3*I + Sqrt[3])*t*U)/(4*Sqrt[2]) -(Sqrt[3]*t*U) 0 0 0 t*(U + I*Sqrt[3]*U) 0 -(t*U) ((1 - I*Sqrt[3])*t^2)/Sqrt[2] t*U 0 ((3 - I*Sqrt[3])*t^2)/Sqrt[2] (5*(1 + I*Sqrt[3])*t*U)/(4*Sqrt[2]) -4*t*U ((1 + I*Sqrt[3])*U^2)/(4*Sqrt[2])
((-3*I)/4)*t*U (Sqrt[3]*U^2)/4 -((-3*I + Sqrt[3])*U^2)/(4*Sqrt[2]) 0 0 (t*(Sqrt[2]*U - I*Sqrt[6]*U))/4 0 ((3 + I*Sqrt[3])*t*U)/(4*Sqrt[2]) (Sqrt[2] - I*Sqrt[6])*t^2 0 I*Sqrt[2]*(I + Sqrt[3])*t^2 (t*(Sqrt[2]*U - I*Sqrt[6]*U))/8 0 t^2*(-4 - U^2/(4*t^2)) ((1 - I*Sqrt[3])*U^2)/(4*Sqrt[2]) (-21*t*U)/4