Plz Tell Me About Hessenberg Matrix In Detail, THX A LOT!?

Question

thankx

I can't open that link. I'm in China and wiki is blocked here

but thank you anyway

Answer 1

Hessenberg matrix
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In linear algebra, a Hessenberg matrix is one that is "almost" triangular. To be exact, an upper Hessenberg matrix has zero entries below the first subdiagonal, and a lower Hessenberg matrix has zero entries above the first superdiagonal.