Parallelepiped with one set of labels (image from the Ask A Mathematician article) |
Changing the labels doesn't change the parallelepiped |
So, they have the same volume. But they do not have the same determinant. So, something is lacking in my intuition about determinants and volumes.
As a first step to understanding this aspect of determinants, I worked out the proof that swapping two vectors negates the determinant for the specific example of the determinant of a two-dimensional matrix, keeping track of the geometric intuition at each step.
For a two dimensional matrix, the determinant is the signed area of the enclosed parallelogram.
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