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Fungrim entry: f617c0

π=4k=0(1)k2k+1\pi = 4 \sum_{k=0}^{\infty} \frac{{\left(-1\right)}^{k}}{2 k + 1}
TeX:
\pi = 4 \sum_{k=0}^{\infty} \frac{{\left(-1\right)}^{k}}{2 k + 1}
Definitions:
Fungrim symbol Notation Short description
ConstPiπ\pi The constant pi (3.14...)
Sumnf ⁣(n)\sum_{n} f\!\left(n\right) Sum
Powab{a}^{b} Power
Infinity\infty Positive infinity
Source code for this entry:
Entry(ID("f617c0"),
    Formula(Equal(ConstPi, Mul(4, Sum(Div(Pow(-1, k), Add(Mul(2, k), 1)), Tuple(k, 0, Infinity))))))

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2019-08-21 11:44:15.926409 UTC