Processus de naissance et de Poisson

{:≥ }
[,+∞)

(,+ ∆ ) ∆
∆

λ
= : ≥, , , , ...
=≤<
<−
(,]
[,]
[+∆ = + |= ] = 
λ∆ + (∆ ) =
(∆ ) >
−λ∆ + (∆ ) =
(∆ ) = (∆ ) ∆→
(∆ )
∆=