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Fungrim entry: f617c0

π=4n=0(1)n2n+1\pi = 4 \sum_{n=0}^{\infty} \frac{{\left(-1\right)}^{n}}{2 n + 1}
TeX:
\pi = 4 \sum_{n=0}^{\infty} \frac{{\left(-1\right)}^{n}}{2 n + 1}
Definitions:
Fungrim symbol Notation Short description
Piπ\pi The constant pi (3.14...)
Sumnf(n)\sum_{n} f(n) Sum
Powab{a}^{b} Power
Infinity\infty Positive infinity
Source code for this entry:
Entry(ID("f617c0"),
    Formula(Equal(Pi, Mul(4, Sum(Div(Pow(-1, n), Add(Mul(2, n), 1)), For(n, 0, Infinity))))))

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2020-08-27 09:56:25.682319 UTC