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Frobenius Normal Form: The Unique Fingerprint of Matrix Similarity
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Dive into the Frobenius (Rational) Canonical Form and discover how it gives each square matrix a unique fingerprint that survives changes of basis. We’ll see why this form avoids eigenvalue factoring, using invariant factors and companion blocks to build a canonical block-diagonal picture. Compare it with diagonalization and Jordan form, and learn when the FNC shines—over any field, including finite fields—providing a definitive answer to when two matrices are similar. We’ll unpack the ideas of cyclic subspaces, minimal polynomials, and the invariant-factor divisibility that guarantees uniqueness.
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