TeX:
\pi = 2 \prod_{n=2}^{\infty} \sec\!\left(\frac{\pi}{{2}^{n}}\right)Definitions:
| Fungrim symbol | Notation | Short description |
|---|---|---|
| Pi | The constant pi (3.14...) | |
| Product | Product | |
| Pow | Power | |
| Infinity | Positive infinity |
Source code for this entry:
Entry(ID("490cf4"),
Formula(Equal(Pi, Mul(2, Product(Sec(Div(Pi, Pow(2, n))), For(n, 2, Infinity))))))