/**
 * NxN matrix Householder reduction
 * Return subfunction to upper Hessenberg matrix by Householder transformation
 * @see http://www-in.aut.ac.jp/~minemura/pub/Csimu/C/QRmethod.html
 * @param {number[]} a
 * @param {number} n
 */
export function matrix_householder_in_place(a: number[], n: number): void;
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