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Fungrim entry: c718ea

∣Tn ⁣(z)∣≤∣Tn ⁣(i∣z∣)∣\left|T_{n}\!\left(z\right)\right| \le \left|T_{n}\!\left(i \left|z\right|\right)\right|
Assumptions:n∈Z and⁡ z∈Cn \in \mathbb{Z} \,\mathbin{\operatorname{and}}\, z \in \mathbb{C}
TeX:
\left|T_{n}\!\left(z\right)\right| \le \left|T_{n}\!\left(i \left|z\right|\right)\right|

n \in \mathbb{Z} \,\mathbin{\operatorname{and}}\, z \in \mathbb{C}
Definitions:
Fungrim symbol Notation Short description
Abs∣z∣\left|z\right| Absolute value
ChebyshevTTn ⁣(x)T_{n}\!\left(x\right) Chebyshev polynomial of the first kind
ConstIii Imaginary unit
ZZZ\mathbb{Z} Integers
CCC\mathbb{C} Complex numbers
Source code for this entry:
Entry(ID("c718ea"),
    Formula(LessEqual(Abs(ChebyshevT(n, z)), Abs(ChebyshevT(n, Mul(ConstI, Abs(z)))))),
    Variables(n, z),
    Assumptions(And(Element(n, ZZ), Element(z, CC))))

Topics using this entry

Copyright (C) Fredrik Johansson and contributors. Fungrim is provided under the MIT license. The source code is on GitHub.

2019-06-18 07:49:59.356594 UTC