.
f(x), 0, . , = 0 , , .
, . .
(. ) , .
0
(. ) , .
0
. 0 f(x), f(x) 0 .
. 0 1- , f(x) , .
, = 0, , .
, 1 . 1 , .
. 0 2 , f(x) .
. ( (1805-1859) , - 1837)
0.
. f(x) = 0 = 0 2 , ..
.
. f(x) =
= 0, , .. = 0 1 . , .. :
:
. f(x) = =
sign(x) . = 0 . .. , 1 . = 0, f(0) = 1, , f(0) = -1, , f(x) - , 1 1, , , = 0 1 . 1 .
, , 1 , , , .
|
|