for n, m, k being Nat
for f being b₁ -element real-valued FinSequence
for A being Matrix of n,m,F_Real
for B being Matrix of k,m,F_Real holds
( (Mx2Tran (A ^ B)) . (f ^ (k |-> 0)) = (Mx2Tran A) . f & (Mx2Tran (B ^ A)) . ((k |-> 0) ^ f) = (Mx2Tran A) . f )