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How do I prove that $\det A= \det A^T$? - Mathematics Stack Exchange 10 I believe your proof is correct Note that the best way of proving that $\det (A)=\det (A^t)$ depends very much on the definition of the determinant you are using My personal favorite way of proving it is by giving a definition of the determinant such that $\det (A)=\det (A^t)$ is obviously true
prove that $\det (ABC) = \det (A) \det (B) \det (C)$ [for any $n×n . . . I was thinking about trying to argue because the numbers of a given matrix multiply as scalars, the determinant is the product of them all and because the order of the multiplication of det (ABC) stays the same, det (ABC) = det (A) det (B) det (C) holds true However, I don't think is a good enough proof and would greatly appreciate some insight
linear algebra - How to show that $\det (AB) =\det (A) \det (B . . . Once you buy this interpretation of the determinant, $\det (AB)=\det (A)\det (B)$ follows immediately because the whole point of matrix multiplication is that $AB$ corresponds to the composed linear transformation $A \circ B$