2.
. .
: .
() .
1. () X Y , (x, y) , .
(x, y) <x, y>.
2. () 1, 2, , n n- (x1, , xn) , . 1=2=n, .
1.
1. X={1, 2, 3}, Y={0, 1}. ; .
2. [0, 1], Y [1, 2]. - (0, 1), (0, 2), (1, 1), (1,2).
2. ( ) r .
, R, : .
r (x, y) , (x, y)Îr xry. ( ) r.
2.
.
1. N:
£ − , , (7, 9) (7, 7), (9, 7);
, − , , (6, 9), (4, 2), (2, 4), (4, 4), (7, 9) (9, 7);
− − , , (2, 4) (4, 4), (4, 2) (7, 9).
2. :
− ;
, ;
Ք (1,y1) (x2,y2), 1 = 2 y1 = −y2.
3. : , , , .
3. N- 1, 2, , n .
, , ()ÎR.
4. r
5. r
rÍ X´Y . 1. Dr Er :
|
|
Dr={x: (x, y) Î r}, Er={y: (x,y)Î r}.
. , :
1. () , .
2. = n, cij, i - j - , 1, ai aj , − 0, :
3.
M={1, 2, 3, 4, 5, 6}. () r, , r .
r, , a, b , a<b.
r = {(1, 2), (1,3), (1, 4), (1, 5), (1, 6), (2, 3), (2, 4), (2, 5), (2, 6), (3, 4), (3, 5), (3, 6), (4, 5), (4, 6), (5, 6)}.
r :
.
6. f X, Y , X Y, (x, y)Îf (x, z)Îf , y=z.
, f g , . Df, Rf. , .
f , (x, y)Îf y=f(x) , y , , y f. y.
7. f n- Y,f:XnY. y=f(x1, x2, , xn) , y x1, x2, , xn.
f: XY.
8. f , 1, 2, y y=f(1) y=f(2) , 1= 2, .
9. f , yÎY Î , y=f(x).
10. f , f .
9 , (), , .
4.
, :
1. f(x)= ex − , ;
2. f(x)=x3-x , ;
3. f(x)=2x+1 .
11. , f, f1, f2, , fk f1, f2, , fk f .
5.
(): , , , ) , .