()
1. ().
2. .
3. .
4. .
5.
.
. .
1. S , : S = , S .. S.
2. V , , , z V = x y z.
V x, y, z.
. n 1, 2,,n,
(1, 2,,n) ÎDÌ Rn
,
(1, 2,,n) ÎD
Î Ì R. , n
: = f (1, 2,,n).
, .. , .
. ,
, (, ) Î D
z Î .
, , : z = f(x, ). (), z ().
D(z) . , z , .
z = f(, ), (, ) Î D (, ) .
z = f(, ) 0 (0, 0) :
z(0, 0), , f(0, 0).
, , .
1) , z . D(z) , (, ), . , . , , . ,
|
|
, . -
, ,
, -
. ,
z = ln (4 2 2) -
. 1 2 + 2 < 4
( , . 1).
2) . : 1, 2, , n, : 1, 2, , n, , :
z 11 = z(x 1, y 1 ), z ij = z(xi, yj) (i = 1, 2, , n; j = 1, 2, , n).
/ | 1 | 2 | ××× | xi | ××× | xn |
y1 | z11 | z21 | ××× | zm1 | ××× | zn1 |
y2 | z12 | z22 | ××× | zm2 | ××× | zn2 |
××× | ××× | ××× | ||||
i | z1j | z2j | ××× | zij | ××× | znj |
××× | ××× | ××× | ××× | ××× | ××× | ××× |
yn | z1n | z2n | ××× | zin | ××× | znn |
3) . z
P(, , z) . D(z) , . z = f(, ) , - (, , f(, )).
, , , .
, 2 + 2 £ 9 (.2) (0, 0, 0) R = 3 (. 3).
. 2 . 3
( ) .
. 1 (1, 1) 2 (2, 2) -
: .
.d- 0 (0, 0)
(, ) , , r(, 0) < d.
d- 0 0 d (. 4).
z = f(, ) -
0 (0, 0),
, .
. 4
. b z = f(, )
0 (0, 0), -
> 0 d > 0 ,
(, ) Î D(z), 0 -
r(, 0) < d -
│ f(, ) b │ < .
.
, , , 0.
|
|