We have a look at the homogeneous version of
example,
so we consider the homogeneous linear system
-
over . Due to
fact,
the solution set is a linear subspace of . We have described it explicitly in
example
as
-
which also shows that the solution set is a vector space. With this description, it is clear that is in bijection with , and this bijection respects the addition and also the scalar multiplication
(the solution set of the inhomogeneous system is also in bijection with , but there is no reasonable addition nor scalar multiplication on ).
However, this bijection depends heavily on the chosen "basic solutions“
and ,
which depends on the order of elimination. There are several equally good basic solutions for .