%0 Journal Article %T A remark on degenerate singularity in three dimensional Ricci flow %A Yu Ding %J Mathematics %D 2007 %I arXiv %X We show that a rescale limit at any degenerate singularity of Ricci flow in dimension 3 is a steady gradient soliton. In particular, we give a geometric description of type I and type II singularities. %U http://arxiv.org/abs/0709.0721v1