Non diagonalization test

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Test for non diagonalizability

In this video, I state and prove the converse to the ultimate test of diagonalization: namely, a matrix is diagonalizable (if and) only if for every eigenvalue, the algebraic multiplicity equals the geometric multiplicity. Intuitively, this means if there aren't enough eigenvectors, then the matrix isn't diagonalizable. This is useful to check if a matrix is not diagonalizable.

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Increible explicacion, hermosa demostracion!

federicoschmidt
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I got confused how you got the dim of the null space of A-3I = 1, but it's just rank-nullity theorem.

ListentoGallegos
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Did Oreo have some watermelon for dinner?

rudolfgyorkei