/**
 * Multiply a floating point expansion by -2.
 * * **error free**
 * * see [Shewchuk](https://people.eecs.berkeley.edu/~jrs/papers/robustr.pdf)
 *
 * @param e a floating point expansion
 */
declare function eMultByNeg2(e: number[]): number[];
export { eMultByNeg2 };