/**
 * Returns the result of multiplying 2 double-double precision coefficient
 * polynomials.
 *
 * * see [polynomial arithmetic](https://en.wikipedia.org/wiki/Polynomial_arithmetic)
 * * see [polynomial multiplication](https://en.wikipedia.org/wiki/Discrete_Fourier_transform#Polynomial_multiplication)
 * * see [polynomial multiplication](http://web.cs.iastate.edu/~cs577/handouts/polymultiply.pdf)
 *
 * @param p1 a polynomial with coefficients given densely as an array of double-double
 * floating point numbers from highest to lowest power
 * @param p2 another polynomial.
 *
 * @doc
 */
declare function ddMultiply(p1: number[][], p2: number[][]): number[][];
export { ddMultiply };