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Fungrim entry: 490cf4

π=2n=2sec ⁣(π2n)\pi = 2 \prod_{n=2}^{\infty} \sec\!\left(\frac{\pi}{{2}^{n}}\right)
\pi = 2 \prod_{n=2}^{\infty} \sec\!\left(\frac{\pi}{{2}^{n}}\right)
Fungrim symbol Notation Short description
Piπ\pi The constant pi (3.14...)
Productnf(n)\prod_{n} f(n) Product
Powab{a}^{b} Power
Infinity\infty Positive infinity
Source code for this entry:
    Formula(Equal(Pi, Mul(2, Product(Sec(Div(Pi, Pow(2, n))), For(n, 2, Infinity))))))

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2021-03-15 19:12:00.328586 UTC