documentation:ref:reverse

Reverse[type1, type2, …] reverses the order of matrices of types type1, type2, … in expressions.

Reverse product of matrices:

defineMatrices 'A', 'B', 'C', Matrix1.matrix
def t = 'A*B*C'.t
println t

   > A*B*C

println Reverse[Matrix1] >> t

   > C*B*A

Reverse does not affect traces:

defineMatrices 'A', 'B', 'C', Matrix1.matrix
println Reverse[Matrix1]  >> 'Tr[A*B*C]'.t

   > Tr[A*B*C]

Reverse with respect to several types of matrices:

defineMatrices 'G_a', Matrix1.matrix, 'U_a', Matrix2.matrix
def t = 'G_a*G_b*U_m*U_n'.t
println Reverse[Matrix1, Matrix2] >> t

   > G_b*G_a*U_n*U_m

Reverse