T ( ). , F(t), Q (t), ..: F(t) = Q (t) - - , f(t) =f(t)- - ...
t:
.
Q(t)=1-(t).
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P(t) l(t) :
f(t) = . , , ,
fH(t) l(t) :
.
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" ", :
P(t):
1. t=0, P(t)=1, .. .
2. P(t) .
3. t→∞, P(t) → 0.
7 , , t1, t1 t2 (t2>t1). . t = t2 - t1 (. 1.7) , 0 t1, :
:
.
:
:
8 , ^ *. No , , (No - , n(t) - t):
. . :
:
:
:
.
:
,
ti i- .