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Linear Algebra - Sebastian Pancratz

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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

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