, .. l.
x 1, . . , , , . . l = (. ). x 1 , = f (x) ( ), = ( ) y = f (x) ( x 2). , x 2 = f (x 1). x 2 , x 3, x 4 . . ,
(14.2) , f (x) [0, 1] [0, 1/4]. [0, 1] , , (14.2) .
l, 1, l. , (. ). (14.2) , , , :
:
(14.3)
l < 1 (14.3) l > 1 (14.3) :
(14.4)
l = 1 : , .