. . t1, . , t2 .. .. :
) , - f(t/li)
)
-, .
R(t) - , .. , 0 t. F(t)=1-R(t) - . f(t)=-dR(t)/dt.
z(t)- , t t+Dt, , t . z(t)=f(t)/R(t)
,
0 ¥ R(t).
z(t). - =. , , .
, z(t) , z(t) , , . z(t) .
z(t) - , z(t)=K(N-i), N - , i - , K - . , ( , ) z(t) .
- ,
, . t, .
, . . , . , , . , .
|
|
- .
. , , ( ). - . .( 2). , .
, , . . , .
, s , . n - , v - . N=sn/v.
N. ( - ). . ( ) : =s/(s+k+1), k - - .