<正>第六次人口普查中,赵姓占全国汉族人口总数的2.29%,是中国第七大姓。在《百家姓》中赵姓起首,和人数无关,《百家姓》形成于宋初的吴越钱塘地区,故而宋朝皇帝的赵氏、吴越
The nonlinear differential equation x′(t)=-δ(t)x(t)+f(t,x(t))(*) is considered,where δ(t) is a periodic function of periodic T,f(t,x) is continuous and perio
报名出洋的幼童,几乎没有一个是世家权贵子弟,大多和容闳一样出身寒微。也许只有这样的人家才"豁得出去",送孩子出洋一搏。这与今天的情形正好相反。近年,留学大潮和央视纪录
In this paper the sufficient conditions for the existence of positive solutions of the neutral difference equations with positive and negative coefficients are
Let G be a k-connected simple graph with order n. The k-diameter, combining connectivity with diameter, of G is the minimum integer dk(G) for which between any
The singularly perturbed initial boundary value problems for reaction diffusion equations are considered. Under suitable conditions and by using the theory of d
Based on the combination of fractional calculus with fractal functions, a new type of is introduced； the definition, graph, property and dimension of this functi
【正】如果选择一种样式,表达一个人的生命,我以为是电影;如果选择一个类型,表达一个国家的命运,我以为还是电影。电影改变生活,这是一个陈旧的话题,却并不过时。作为一名电
在第六次人口普查中,黄姓人口约占全国人口的2.23%,是中国第八大姓。黄姓是个南方姓,广东省的黄姓人口最多,约占全国汉族黄姓人口的19%。四川、湖南、广西、江西等省黄姓人口
The cutwidth problem for a graph G is to embed G into a path such that the maximum number of overlap edges is minimized. This paper presents an approach based o