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Fungrim entry: b786ad

Pn(x)n(n+1)2\left|P'_{n}(x)\right| \le \frac{n \left(n + 1\right)}{2}
Assumptions:nZ0  and  1x1n \in \mathbb{Z}_{\ge 0} \;\mathbin{\operatorname{and}}\; -1 \le x \le 1
\left|P'_{n}(x)\right| \le \frac{n \left(n + 1\right)}{2}

n \in \mathbb{Z}_{\ge 0} \;\mathbin{\operatorname{and}}\; -1 \le x \le 1
Fungrim symbol Notation Short description
Absz\left|z\right| Absolute value
ComplexDerivativeddzf ⁣(z)\frac{d}{d z}\, f\!\left(z\right) Complex derivative
LegendrePolynomialPn ⁣(z)P_{n}\!\left(z\right) Legendre polynomial
ZZGreaterEqualZn\mathbb{Z}_{\ge n} Integers greater than or equal to n
Source code for this entry:
    Formula(LessEqual(Abs(ComplexDerivative(LegendrePolynomial(n, x), For(x, x, 1))), Div(Mul(n, Add(n, 1)), 2))),
    Variables(n, x),
    Assumptions(And(Element(n, ZZGreaterEqual(0)), LessEqual(-1, x, 1))))

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2021-03-15 19:12:00.328586 UTC