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Mackey-Glass

$$dx/dt = β * x(t - τ) / (1 + x(t - τ)^n) - γ * x(t)$$

• 欧拉法：$x(t + h) = x(t) + h * (β * x(t - τ) / (1 + x(t - τ)^n) - γ * x(t))$
• 隐式中点法：$x(t + h) = x(t) + h * (β * x(t + h - τ) / (1 + x(t + h - τ)^n) - γ * x(t + h))$

Ikeda System