美国“整合”中东政策及其困境

为称霸全球，美国在中东开始实行以反恐、防扩、民主改造伊斯兰世界为基本特征的“整合”政策。中东政治的现实虽为其提供了一定的基础，但“整合”政策的缺失，必遇重重阻力。     

《太极图说解》的理学思想述略——兼论朱熹与周敦颐的思想渊源

朱熹推尊周敦颐《太极图说》,以理学立场对《太极图说》进行了诠释与发挥,并作有《太极图说解》一书。朱熹《太极图说解》明确把《太极图说》纳入理学思想体系,宗奉二程,以＂理＂、＂气＂释太极,辟佛、道归儒,勾勒出天道性命贯通为一的学说,由此推阐出理学体系的基本框架。     

A combinatorial theorem on labeling squares with points and its application

In this paper, we present a combinatorial theorem on labeling disjoint axis-parallel squares of edge length two using points. Given an arbitrary set of disjoint axis-parallel squares of edge length two, we show that if we label points on the boundary of all squares (one for each square) and define a distance label graph such that there is an edge between any two labeling points if and only if their L_∞-distance is at most 1 − ε (0 < ε < 1), then the maximum connected component of the graph contains Θ(1/ε) vertices, which is tight. With this theorem we present a new and simple factor-(3 + ε) approximation for labeling points with axis-parallel squares under the slider model. This research is supported by NSF CARGO Grant DMS-0138065.