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(def lazy-fib
(concat
[0 1]
((fn rfib [a b]
(lazy-cons (+ a b) (rfib b (+ a b)))) 0 1)))

The Lorenz Equations

\begin{aligned} \dot{x} & = σ (y - x) \\ \dot{y} & = ρ x - y - x z \\ \dot{z} & = - β z + x y \end{aligned}