(˲ )
x = F (x).
.
x0, x1,..., xn, {xn}, , - n $ 1 xn
xn - 1 xn = F (xn - 1), x0 - F (x).
, {xn} (4) .
5. F (x) [a;b], {xn} "c", "c" (4).
5 .
. {xn} "c" [a;b], "c" . {xn} c xn xn = b ( xn a). , c c = b ( c a).
xn = b, xn a . yn = xn - b , {yn} d = c - b. , d . , , , yn , {yn} d yn, , d .
.
5, , c {xn} [a;b]. , f (x), , c. {xn} c. n xn = F (xn - 1), , c = F (c), c (4).
5 .
6. "c" (4) "c" [c - e, c + e], e > 0, F (x) F '(x)
| F '(x) | = a < 1.
{xn}, x0 - [c - e, c + e], "c". , n- xn
| xn - c | = ean.
1. , F (x), (5), .
2. (6) , {xn} c .
|
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6. 5 6 {xn} c (4) , xn [c - e, c + e]. . 6 x0 [c - e, c + e], , , xn n $ 0 , , xn + 1 . , xn + 1 = F (xn), c = F (c), ,
xn + 1 - c = F (xn) - F (c).
, , , F (x) , c xn, 4 () c xn xn,
F (xn) - F (c) = (xn - c)F '(xn).
(7) (8) (5), [c - e, c + e], ,
| xn + 1 - c | < a | xn - c |.
(9) , a < 1, ,
| xn + 1 - c | < | xn - c |.
(10) , xn + 1 c, xn, xn [c - e, c + e], xn + 1 .
, {xn} [c - e, c + e], 6 .
- n (6). (9) n, 0, 1, 2,..., n - 1, ,
| xn - c | < an | x0 - c | < ean.
6 .
. , , c (4) [a, b], F(x) , (5). [a, b], , , , c, , x0, {xn} 6. , , [a;b] c, c [a, 2c - a] [2c - b, b] [a, b]. a b c , (5), a b 6 x0. x0 a b, x1 = F (x0) [a,b].
, F'(x) [a, b] . , (7) (8) , {xn} ( , ). . F'(x) [a, b], (7) (8) , - xn xn + 1 c. .
1.