Today I saw Dan Witzner perform more matrix magic. Nothing really new, but this stuff keeps falling right out of my head so I will try to remember this:
If Ax=yx then x is an eignvector af A and y is the corresponding eignvalue.
If A is invertible then it's non-singular and det(A)=! 0 and vice versa.
If A is not invertible then it's singular and det(A) = 0 and vice versa.
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