/*
 * @(#)$Id: double,v 1.1 1994/09/16 09:37:56 dream Exp $
 *
 * $Log: double,v $
 * Revision 1.1  1994/09/16 09:37:56  dream
 * Initial revision
 *
 */

double(n)<==>p_ind(n,0,[p,r,s(s(r))]).
