S , ( ) ( ), . , .
.
z= f(x,) , a S , f. S , , [f,f].
. .
. ʎ->0 f(x;y) D. D
.
1. f(x;y) D, kf(x;y) D
2. f(x;y) g(x;y) D,
3. f(x;y) g(x;y) D f(x; ) <= g(x; ) D,
4. f(x;y) ,
5. . D D1 D2, , , D=D1 D2, f(x;y) D1 D2, D ,
6. . f(x;y) D, (, ),
f(x, ) = {a=<=<b, =<=<d), P
G , f G, G f G. , .
G
.
f(x,y) G [,b]
. .
:
52. : .
. ʎ->0 f(x;y) D. D