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x Ax = b <br />
det A îb = det(A(1) , . . . , A (i−1) , b, A (i+1) , . . . , A (n) )<br />
= <br />
j=1<br />
= xi det A,<br />
xi = 1<br />
detA det Aîb i = 1, . . . , n<br />
xj det(A (1) , . . . , A (i−1) , A (j) , A (i+1) , . . . , A (n) )<br />
A ∈ Mn(Z) det A = ±1 b ∈ Z n Ax = b<br />
Z