REACTION RATES
CURRENT STATE
Time t: 0.000
N_A: 100
N_B: 0
N_C: 0
Total: 100
Rxn count: 0
WAITING TIMES
Exponential waiting time dist.
Gillespie SSA (1976): exact simulation of stochastic chemical kinetics. Draw τ=-ln(U)/a₀, choose reaction by propensity. Rigorously exact — no approximation, unlike Euler-Maruyama or tau-leaping.
Top: trajectories (blue=A, green=B, pink=C, dashed=ODE) Bottom: A-B phase plane