Generation MGF: M_T=γ/(γ−s); E[T]=1/γ; E[T²]=2/γ²; Var[T]=1/γ²

Sympy-exact symbolic witness of the generation-interval exponential MGF canonical form and its moment anchors. Setup: γ, s — both positive symbols. Generation-interval T ~ Exp(γ); density f(τ) = γ·exp(−γ·τ). MGF: M_T(s) = γ/(γ−s) for s…