Basic solutions
That is to say Ax = B a system of linear equations with A :
m × n, m = n and range(A) = m and B a base of A.
In the base B, the system is written (with a permutation close to its
columns)
The particular solution obtained while fixing at 0 the variables except
base xN is called basic solution (or base solution) associated the base
B It is equal to :
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