# Legendre polynomials

**Legendre polynomials** (also known as Legendre functions of the first kind, Legendre coefficients, or zonal harmonics)
are solutions of the Legendre differential equation.
The Legendre polynomial, can be defined by the contour integral

Legendre polynomials can also be defined (Ref 1) using Rodrigues formula, used for producing a series of orthogonal polynomials, as:

Legendre polynomials form an orthogonal system in the range [-1:1], i.e.:

- for

whereas

The first seven Legendre polynomials are:

"shifted" Legendre polynomials (which obey the orthogonality relationship in the range [0:1]):

Powers in terms of Legendre polynomials:

## Applications in statistical mechanics[edit]

- Computational implementation of integral equations
- Order parameters
- Lebwohl-Lasher model
- Rotational relaxation

## See also[edit]

## References[edit]

- B. P. Demidotwitsch, I. A. Maron, and E. S. Schuwalowa, "Métodos numéricos de Análisis", Ed. Paraninfo, Madrid (1980) (translated from Russian text)