%0 Journal Article %T Abelian functions for trigonal curves of degree four and determinantal formulae in purely trigonal case %A Yoshihiro £¿nishi %J Mathematics %D 2005 %I arXiv %X This paper gives a natural extension of Frobenius-Stickelberger formula and Kiepert formula to Abelian functions for "Purely Trigonal Curves", especially, of degree four. A description on the theory of Abelian functions for general trigonal curves of degree four is also included. %U http://arxiv.org/abs/math/0503696v2