PageHeader : Funkcialaj Ekvacioj, 35 (1992) 117-135 Title : On the Level Sets of the Solutions for $u_{t}=u_{xx}+f(u)$ Title : with $f(u)=u^{\alpha}$ or $u(\log(1/u))_{+}^{\beta}$ AuthorInfo : By AuthorInfo : Takasi SENBA AuthorInfo : (Fukuoka University, Japan) section : Introduction section : 1. The existence of a solution for (I.P) section : 2. Some relations between the level set $L(t, $ k) and the conditions of $f$ section : 3. Examples section : 4. The uniqueness of the solution section : References