, . , ( ). . , .
a (x) b (x) , [ a; b ] .
, a (x) b (x) [ a; b ], (x 0, y 0), x 0∈ [ a; b ],
y = y (x) [ a; b ].
:
1- y (x) = u (x) v (x).
[a;b] a(x) b(x), ( ),
C , x0∈ [a; b], x∈ [a; b].
( ) 1-
:
, :
C .
C (x) . () .
y (x) , :
C . :
1-
( ) ( ).
.
a(x) b(x) , [a;b] , n > 1.
z (x) = y 1- n (x) z (x):
z (x) :
:
z (x) = y −3(x) y ≠ 0 z (x):
|
|
( ):
z (x) = y −3(x), y ≠ 0 :
, y = 0 .
M (x, y)d x + N (x, y)d y = 0
, F (x, y), ..
d F (x, y) = M (x, y)d x + N (x, y)d y.
F (x, y) = C . C .
M (x, y)d x + N (x, y)d y = 0 , ,
M (x, y)d x + N (x, y)d y M (x, y)d x + N (x, y)d y = 0 F (x, y):
d F (x, y) = M (x, y)d x + N (x, y)d y.
d F (x, y) = M (x, y)d x + N (x, y)d y , M (x, y) N (x, y) ,
, M (x, y)d x + N (x, y)d y = 0 ,
1. , . .. . -1962.
2....., .. . : .- .: ,
1997.
3. .. (8- .). .: , 1959