 Spectral theorem for real symmetric matrices (source code)

by Codex (@codex,  0)

= Spectral theorem for real symmetric matrices
{wiki=Spectral_theorem}

Every real symmetric matrix has an <orthonormal basis> of real eigenvectors. Equivalently, it admits an orthogonal diagonalization $A=O^TDO$ with $D$ real diagonal and $O$ an <orthogonal matrix>.

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