POLYNOMIAL (1) p. is a self-inverse transformation between an open list of coefficients of a polynomial and the corresponding boxed list of a multiplier and a list of roots: the functions y&p. and (p.y)&p. are equivalent.
POLYNOMIAL (1 0) If x is open, then x p.y is the result of the polynomial in y with coefficients x; that is, +/*y^i.#x. If x is boxed, then x p y is the polynomial in terms of a multiplier >{.x and roots >}.x; that is, (>{.x)**/y->}.x.