【摘要】 给出了分形集的两种密度定义，讨论了它们的关系及性质。通过Ｖｉｔａｌｉ覆盖定理，证明了Ｈａｕｓｄｏｒｆ凸密度定理。更多还原

【Abstract】 In this paper,two density definitions of fractal set are given,their relation and properties are discussed.Theorem of Hausdorff convex density is proved by Vitali covering theorem.更多还原