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Developer`HessenbergDecomposition
HessenbergDecomposition[m] gives the Hessenberg decomposition of a matrix m.
The result is given in the form p, h where p is a unitary matrix such that p . h . Conjugate[Transpose[p]] == m. See also: SchurDecomposition.
HessenbergDecomposition[m] gives the Hessenberg decomposition of a matrix m. 
p, h
where p is a unitary matrix such that p . h . Conjugate[Transpose[p]] == m. 
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