/**
 * Returns the result of multiplying together an array of double-double-precision
 * floating point numbers naively (i.e. not using pairwise addition to reduce
 * error a bit).
 *
 * * an error bound is given by: (n-1)(1+ϵ),
 * where ϵ <= 7u^2, u = 0.5 * Number.EPSILON
 */
declare function ddProduct(qs: number[][]): number[];
export { ddProduct };