PageHeader : Funkcialaj Ekvacioj, 42 (1999) 1-7 Title : On the Defining Variety and Birational Canonical Transformations Title : of the Fourth Painleve Equation AuthorInfo : By AuthorInfo : Humihiko WATANABE AuthorInfo : (Kyushu University, Japan) section : 0. Introduction section : 1. Defining variety section : 2. Birational canonical transformations section : References