```
f(z) = z^3 - 1
fp(z): deriv f(z)
n(z) = z - f(z)/fp(z)
plot(z): iter w = z, w = f(w), w, 100
```

unary ops: - / (neg recip)
binary ops: + - * / ^ (add sub mul div pow)
holomorphic fns: sqrt exp ln sin cos tan sinh cosh tanh asin acos atan asinh acosh atanh gamma
bad fns: re im abs abssq arg conj
higher order: iter deriv
constants: i tau e

type sigils: complex, $function, @integer