Is ABCDEF = AB(C(D))EF for matricies

[eax]

is ABCDEF = AB(C(D))EF for matricies? Also is ABCD(EFGH) = ABCDEFGH?

Thanks in advance!

 

[EnumaElish]

is ABCDEF = AB(C(D))EF for matricies? Also is ABCD(EFGH) = ABCDEFGH?

"Yes" to both, although I am not sure what C(D) means in terms of matrix multiplication.

 

[HallsofIvy]

Yes, multiplication of matrices is "associative".