Matrix t2*K(2) in Subspace 89 with Dimension 16

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

-3*t*U (I/2)*Sqrt[3]*U^2 0 (I/2)*Sqrt[3]*t*U (-2 + (2*I)*Sqrt[3])*t^2 0 (I/4)*(3*I + Sqrt[3])*t*U 0 Sqrt[2]*t*U 0 ((3 - I*Sqrt[3])*t*U)/4 0 0 (I/2)*(3*I + Sqrt[3])*t*U 0 -(t*(U + I*Sqrt[3]*U))/4
(-I/2)*Sqrt[3]*U^2 (-3*t*U)/2 ((-I/2)*(-I + Sqrt[3])*t*U)/Sqrt[2] (-1 - I*Sqrt[3])*t^2 0 0 -2*t^2 -(t*(U + I*Sqrt[3]*U))/2 0 (t*(U + I*Sqrt[3]*U))/2 (1 + I*Sqrt[3])*t^2 0 ((3 + I*Sqrt[3])*t*U)/2 (1 + I*Sqrt[3])*t^2 -(t*U) 0
0 ((I/2)*(I + Sqrt[3])*t*U)/Sqrt[2] -4*t*U ((1 - I*Sqrt[3])*U^2)/(2*Sqrt[2]) ((3 - I*Sqrt[3])*t*U)/Sqrt[2] 0 U^2/Sqrt[2] 0 (-3 - I*Sqrt[3])*t^2 0 0 (1 - I*Sqrt[3])*t^2 0 0 0 0
(-I/2)*Sqrt[3]*t*U (-1 + I*Sqrt[3])*t^2 ((1 + I*Sqrt[3])*U^2)/(2*Sqrt[2]) -5*t*U -U^2/2 -(U^2/Sqrt[2]) ((-7 - (3*I)*Sqrt[3])*t*U)/4 (8*t^2 + (-1 - I*Sqrt[3])*U^2)/4 (t*(Sqrt[2]*U - I*Sqrt[6]*U))/4 (1 + I*Sqrt[3])*t^2 (t*(U + I*Sqrt[3]*U))/4 0 0 -(t*(U + I*Sqrt[3]*U))/2 (-1 - I*Sqrt[3])*t^2 (t*(U + I*Sqrt[3]*U))/4
(-2 - (2*I)*Sqrt[3])*t^2 0 ((3 + I*Sqrt[3])*t*U)/Sqrt[2] -U^2/2 -4*t*U 0 -U^2/2 (3*(3 + I*Sqrt[3])*t*U)/4 0 (t*(U - I*Sqrt[3]*U))/4 0 0 (t*U)/2 0 -(t*(U + I*Sqrt[3]*U))/4 0
0 0 0 -(U^2/Sqrt[2]) 0 -6*t*U -(U^2/Sqrt[2]) (((-3*I)/2)*(-3*I + Sqrt[3])*t*U)/Sqrt[2] (-1 - I*Sqrt[3])*t^2 (t*U)/Sqrt[2] 0 (-3 + I*Sqrt[3])*t^2 -(Sqrt[2]*t*U) 0 -((t*U)/Sqrt[2]) 0
(-I/4)*(-3*I + Sqrt[3])*t*U -2*t^2 U^2/Sqrt[2] ((-7 + (3*I)*Sqrt[3])*t*U)/4 -U^2/2 -(U^2/Sqrt[2]) -5*t*U t^2*(1 + I*Sqrt[3] - U^2/(2*t^2)) -((t*U)/Sqrt[2]) (1 - I*Sqrt[3])*t^2 (t*U)/2 0 0 -(t*U) (-1 + I*Sqrt[3])*t^2 -(t*U)/2
0 (I/2)*(I + Sqrt[3])*t*U 0 (8*t^2 + I*(I + Sqrt[3])*U^2)/4 (3*(3 - I*Sqrt[3])*t*U)/4 (((3*I)/2)*(3*I + Sqrt[3])*t*U)/Sqrt[2] t^2*(1 - I*Sqrt[3] - U^2/(2*t^2)) -5*t*U 0 -(t*U)/2 2*t^2 0 (I/4)*(3*I + Sqrt[3])*t*U 2*t^2 (t*(U - I*Sqrt[3]*U))/4 0
Sqrt[2]*t*U 0 (-3 + I*Sqrt[3])*t^2 (t*(Sqrt[2]*U + I*Sqrt[6]*U))/4 0 (-1 + I*Sqrt[3])*t^2 -((t*U)/Sqrt[2]) 0 -3*t*U -(U^2/Sqrt[2]) (3*(3 - I*Sqrt[3])*t*U)/(2*Sqrt[2]) 0 0 0 ((-I/2)*(-I + Sqrt[3])*U^2)/Sqrt[2] 0
0 (t*(U - I*Sqrt[3]*U))/2 0 (1 - I*Sqrt[3])*t^2 (t*(U + I*Sqrt[3]*U))/4 (t*U)/Sqrt[2] (1 + I*Sqrt[3])*t^2 -(t*U)/2 -(U^2/Sqrt[2]) -4*t*U t^2*(1 - I*Sqrt[3] - U^2/(2*t^2)) ((1 - I*Sqrt[3])*U^2)/(2*Sqrt[2]) ((3 - I*Sqrt[3])*t*U)/4 (-1 + I*Sqrt[3])*t^2 ((-1 + (5*I)*Sqrt[3])*t*U)/4 (-I/4)*(-I + Sqrt[3])*U^2
((3 + I*Sqrt[3])*t*U)/4 (1 - I*Sqrt[3])*t^2 0 (t*(U - I*Sqrt[3]*U))/4 0 0 (t*U)/2 2*t^2 (3*(3 + I*Sqrt[3])*t*U)/(2*Sqrt[2]) t^2*(1 + I*Sqrt[3] - U^2/(2*t^2)) -4*t*U 0 0 t*U ((4 + (4*I)*Sqrt[3])*t^2 + (1 - I*Sqrt[3])*U^2)/4 ((-3*I)/2)*Sqrt[3]*t*U
0 0 (1 + I*Sqrt[3])*t^2 0 0 (-3 - I*Sqrt[3])*t^2 0 0 0 ((1 + I*Sqrt[3])*U^2)/(2*Sqrt[2]) 0 -5*t*U 0 (t*(Sqrt[2]*U + I*Sqrt[6]*U))/4 -(U^2/Sqrt[2]) ((3 - I*Sqrt[3])*t*U)/Sqrt[2]
0 ((3 - I*Sqrt[3])*t*U)/2 0 0 (t*U)/2 -(Sqrt[2]*t*U) 0 (-I/4)*(-3*I + Sqrt[3])*t*U 0 ((3 + I*Sqrt[3])*t*U)/4 0 0 -6*t*U (-I/4)*(-3*I + Sqrt[3])*U^2 (I/4)*(3*I + Sqrt[3])*t*U (2 - (2*I)*Sqrt[3])*t^2
(-I/2)*(-3*I + Sqrt[3])*t*U (1 - I*Sqrt[3])*t^2 0 (I/2)*(I + Sqrt[3])*t*U 0 0 -(t*U) 2*t^2 0 (-1 - I*Sqrt[3])*t^2 t*U (t*(Sqrt[2]*U - I*Sqrt[6]*U))/4 (I/4)*(3*I + Sqrt[3])*U^2 (-15*t*U)/2 (-1 - I*Sqrt[3])*t^2 0
0 -(t*U) 0 (-1 + I*Sqrt[3])*t^2 (I/4)*(I + Sqrt[3])*t*U -((t*U)/Sqrt[2]) (-1 - I*Sqrt[3])*t^2 (t*(U + I*Sqrt[3]*U))/4 ((I/2)*(I + Sqrt[3])*U^2)/Sqrt[2] -(t*(U + (5*I)*Sqrt[3]*U))/4 ((4 - (4*I)*Sqrt[3])*t^2 + (1 + I*Sqrt[3])*U^2)/4 -(U^2/Sqrt[2]) (-I/4)*(-3*I + Sqrt[3])*t*U (-1 + I*Sqrt[3])*t^2 -4*t*U -U^2/2
(I/4)*(I + Sqrt[3])*t*U 0 0 (t*(U - I*Sqrt[3]*U))/4 0 0 -(t*U)/2 0 0 (I/4)*(I + Sqrt[3])*U^2 ((3*I)/2)*Sqrt[3]*t*U ((3 + I*Sqrt[3])*t*U)/Sqrt[2] (2 + (2*I)*Sqrt[3])*t^2 0 -U^2/2 -5*t*U