## Elliptic Functions (Google eBook)In its first six chapters this 2006 text seeks to present the basic ideas and properties of the Jacobi elliptic functions as an historical essay, an attempt to answer the fascinating question: 'what would the treatment of elliptic functions have been like if Abel had developed the ideas, rather than Jacobi?' Accordingly, it is based on the idea of inverting integrals which arise in the theory of differential equations and, in particular, the differential equation that describes the motion of a simple pendulum. The later chapters present a more conventional approach to the Weierstrass functions and to elliptic integrals, and then the reader is introduced to the richly varied applications of the elliptic and related functions. Applications spanning arithmetic (solution of the general quintic, the functional equation of the Riemann zeta function), dynamics (orbits, Euler's equations, Green's functions), and also probability and statistics, are discussed. |

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This is a very BAD good book. The way the material is presented is great but the number of typographical errors makes it unreadable especially by students. The first typo is page xi, and you can find pages with more than 4 typographical errors (e.g. p. 46 to 48), I stopped counting them after reaching one hundred!

Mathematical typography is bad, even inconsistent, (Jacobi functions, sn, cn... are in italic instead of regular but not always (p.60, one sn is OK, so why not all) and sometimes you find dn written with d straight and n in italic, p. 234,239!). Very often figures are wrong, one is missing (p. 255).

I have never bought a book with so many mistakes, this book is not worth the money I spent on it.

### Contents

1 | |

Jacobian elliptic functions of a complex variable | 25 |

General properties of elliptic functions | 62 |

Theta functions | 75 |

The Jacobian elliptic functions for complex k | 107 |

Introduction to transformation theory | 136 |

The Weierstrass elliptic functions | 156 |

Elliptic integrals | 210 |

Applications of elliptic functions in geometry | 232 |

Applications in mechanics statistics and other topics | 338 |

An application of elliptic functions in algebra solution of the general quintic equation 276 | xii |

379 | |

### Common terms and phrases

addition formulae addition theorem analytic applications Chapter circle cn(u coefﬁcients complex numbers consider constant converges cubic deduce deﬁned deﬁnition denotes differential equation dn(u dn2u doubly periodic elliptic curve elliptic integrals example Exercise expansion expressed ﬁeld ﬁnd ﬁnite ﬁrst follows fundamental region Gauss given Hence identity imaginary implies Jacobi functions Jacobian elliptic functions Julia set k2 sin2 Lawden Lemma modular equation modulus multiplicities obtain odd function oo oo parameter pendulum period lattice plane points polynomial Prasolov problem proof of Theorem properties prove quadratic quartic quintic quintic equation rational function recall replaced residue respectively result Riemann zeta function roots Section simple poles simple zeros sn(u sn(x Solovyev solution squares suppose theory of elliptic theta functions transformation variable Weierstrass function whence Whittaker & Watson write