, , .
λ (t) , , . Ÿ
. (3.10)
(t) , . (3.10), (t) λ (t). (3.10) ,
λ (t) × dt = - d (t) / (t). (3.11)
(3.11) 0 t,
(3.12)
(3.13)
t = 0 (0) = 1, = 0.
(3.14)
λ (t)
(3.15)
λ ( ) t 3.2.
, . , , λ , . , , (3.14) :
(3.16)
. .