theorem Th8: :: MATRIX12:8

for k, l, n being Nat
for K being Field
for a being Element of K
for A being Matrix of n,K st l in dom (1. (K,n)) & k in dom (1. (K,n)) holds
(RLineXS ((1. (K,n)),l,k,a)) * A = RLineXS (A,l,k,a)