1.
- , -
: ,, ,
- ,
:
2.
( ) , "", . . : a1, a2,..., an, , 1 n . , "" .
, , . ,
. .
3.
.
:
1. A∪B = B∪A ();
2. (∪B) ∪C = (B∪C) ();
3. A⊇B, ∪= ;
4. .
.
:
1. A∩B = B∩A ();
2. (A∩)∩ = ∩(∩) ();
3. A⊇B, ∩B = ;
4. ∩Ø=Ø.
4.
1), 2) , . :
5.
X Y, - . (X,Y,R) X Y. xRy "x y."
6.
2 .
7.
, , , , , , , , ( ), ;
y = xa = ea ln x;
8.
: z = h (y) y = g (x), g h. z = h (g (x)) h g, , .
9.
y = f (x), x N, N ( ), y = f (n) y 1, y 2,, yn,. y 1, y 2, y 3, , , , .
10.
, 0. limn ¥ xn = 0
|
|
11.
" e>0 $ N: " n>N |xn| < e Þ xn.
( ε N , xn )
: xn = 1/n
12.
( )
- .
- .
.
.
13.
xn , " c>0 $ N: " n>N |xn|>c.
: n, 2n .
14.?
1. f(x) x→a, 1/f(x) x→a.
2. f(x) - x→a ( x→∞) , y=1/f(x) .
15.
{xn}, e N, xn, n>N,
|n - a| < ε.
16.
, :
)
17.
, $ AÎ R $ N, n>N xn = A.
( )
- .
- , .
- .
18.
. x1,x2,..., xn,... . |xn-A|<e A- e < xn < A + e, , xn e - A (.13). e - .