// Test equation numbering.

---
#set page(width: 150pt)
#set math.equation(numbering: "(I)")

We define $x$ in preparation of @fib:
$ phi.alt := (1 + sqrt(5)) / 2 $ <ratio>

With @ratio, we get
$ F_n = round(1 / sqrt(5) phi.alt^n) $ <fib>
