Monotonicity Formula On Cigar Soliton

In this paper, we prove a monotonicity formula on cigar soliton. Using the monotonicity, obtain three-ball type theorem. There might be some people who have proved theorem Cigar Soliton before, but use new method. We add weight function in norm of u. By doing so, make calculation process much easier because when using integral by part, term that integrates at surface ball would disappear as zero.