What I don't understand:
I don't understand why in the proof
det(Q) = $λa_{i1}C_{i1}$(A) + $λa_{i2}C_{i2}$(A) + ... + $λa_{in}C_{in}$(A).
Shouldn't the det(Q) = $λa_{i1}C_{i1}$(Q) + $λa_{i2}C_{i2}$(Q) + ... + $λa_{in}C_{in}$(Q)?
2026-04-01 00:29:58.1775003398
I need help understanding a simple proof about determinants of matrices.
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The determinant is evaluated according to the $i$th row and so the equation in the proof is correct.