### Abstract

Associated Legendre functions of fractional degree appear in the solution of boundary value problems on wedges or in toroidal geometries, and elsewhere in applied mathematics. In the classical case when the degree is half an odd integer, they can be expressed using complete elliptic integrals. In this study, many transformations are derived, which reduce the case when the degree differs from an integer by one-third, one-fourth or one-sixth to the classical case. These transformations or identities facilitate the symbolic manipulation and evaluation of Legendre and Ferrers functions. They generalize both Ramanujan's transformations of elliptic integrals and Whipple's formula, which relates Legendre functions of the first and second kinds. The proofs employ algebraic coordinate transformations, specified by algebraic curves.

Original language | English (US) |
---|---|

Article number | 0097 |

Journal | Proceedings of The Royal Society of London, Series A: Mathematical and Physical Sciences |

Volume | 472 |

Issue number | 2188 |

DOIs | |

State | Published - Apr 1 2016 |

### Fingerprint

### Keywords

- Algebraic curve
- Algebraic transformation
- Ferrers function
- Legendre function
- Toroidal function
- Whipple's formula

### ASJC Scopus subject areas

- Mathematics(all)
- Engineering(all)
- Physics and Astronomy(all)

### Cite this

**Legendre functions of fractional degree : Transformations and evaluations.** / Maier, Robert S.

Research output: Contribution to journal › Article

}

TY - JOUR

T1 - Legendre functions of fractional degree

T2 - Transformations and evaluations

AU - Maier, Robert S

PY - 2016/4/1

Y1 - 2016/4/1

N2 - Associated Legendre functions of fractional degree appear in the solution of boundary value problems on wedges or in toroidal geometries, and elsewhere in applied mathematics. In the classical case when the degree is half an odd integer, they can be expressed using complete elliptic integrals. In this study, many transformations are derived, which reduce the case when the degree differs from an integer by one-third, one-fourth or one-sixth to the classical case. These transformations or identities facilitate the symbolic manipulation and evaluation of Legendre and Ferrers functions. They generalize both Ramanujan's transformations of elliptic integrals and Whipple's formula, which relates Legendre functions of the first and second kinds. The proofs employ algebraic coordinate transformations, specified by algebraic curves.

AB - Associated Legendre functions of fractional degree appear in the solution of boundary value problems on wedges or in toroidal geometries, and elsewhere in applied mathematics. In the classical case when the degree is half an odd integer, they can be expressed using complete elliptic integrals. In this study, many transformations are derived, which reduce the case when the degree differs from an integer by one-third, one-fourth or one-sixth to the classical case. These transformations or identities facilitate the symbolic manipulation and evaluation of Legendre and Ferrers functions. They generalize both Ramanujan's transformations of elliptic integrals and Whipple's formula, which relates Legendre functions of the first and second kinds. The proofs employ algebraic coordinate transformations, specified by algebraic curves.

KW - Algebraic curve

KW - Algebraic transformation

KW - Ferrers function

KW - Legendre function

KW - Toroidal function

KW - Whipple's formula

UR - http://www.scopus.com/inward/record.url?scp=84968538004&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84968538004&partnerID=8YFLogxK

U2 - 10.1098/rspa.2016.0097

DO - 10.1098/rspa.2016.0097

M3 - Article

AN - SCOPUS:84968538004

VL - 472

JO - Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences

JF - Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences

SN - 0962-8444

IS - 2188

M1 - 0097

ER -