S S1,S2,,Sn. Pi(t) , Si
n
, ∑ = Pi(t) = 1
i=1
P1(t),P2(t),, Pn(t) i j
λij
Si → Sj
λij = Lim Pij(Δt) / Δt Δt→0 | (6.1) |
Pij(Δt) Si → Sj Δt
Pij(Δt) = λij Δt | (6.2) |
λij Si, Sj , . i(t) . . .
1(t+ Δt) = P1(t){1-[P12(Δt)+P13(Δt)]}+P2(t)P21(Δt) | (6.3) |
1(t+ Δt) = P1(1){1-[ λ12 Δt+ λ13Δt]}+P2(t) λ21 Δt | (6.4) |
6.4
dP1(t) / Δt = λ12P1(t) - λ13P1(t) + λ21 P2(t) | (6.5) |
S2 S3
dP2(t)/ dt = λ21P2(t) λ23P2(t)+ λ12P1(t)+ λ32P3(t) | (6.6) |
dP3(t)/ dt = - λ32P3(t) + λ13P1(t)+ λ23P2(t) | (6.7) |
.
. , s. s, t=0
P1(t) = 1, P2(t)=0, P3(t) = 0
, , t .
P1(t)+P2(t)+P3(t) =1 | (6.8) |
.
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λij = const