PageHeader : Funkcialaj Ekvacioj, 45 (2002) 237-258 Title : Backlund Transformations and the Manifolds of Painleve Systems AuthorInfo : By AuthorInfo : Masatoshi NOUMI, Kyoichi TAKANO and Yasuhiko YAMADA AuthorInfo : (Kobe University, Japan) section : 1. Introduction section : 2. Backlund transformation groups subsection : 2.1. The case of $J=II$ subsection : 2.2. The case of $ J=III$ subsection : 2.3. The case of $ J=IV$ subsection : 2.4. The case of $J=V$ subsection : 2.5. The case of $J=VI$ subsection : 2.6. Propositions section : 3. The manifolds $E_{J,\alpha}$ subsection : 3.1. Descriptions of $E_{J,\alpha}$ subsection : 3.2. Hamiltonians on the other charts subsection : 3.3. A proposition section : 4. Proof of Theorem 2 section : 5. Proof of Theorem 1?for $J=II,III,IV$ , $V$ subsection : 5.1. Extension of $\phi$ and $\phi_{w}$ subsection : 5.2. Surjectivity of $\varphi$ and $\varphi_{w}$ section : 6. Proof of Theorem 1?for $J =VI$ subsection : 6.1. Extension of $\phi$ and $\phi_{w}$ subsection : 6.2. Surjectivity of $\varphi$ and $\varphi_{w}$ section : References