事实上陈省身教授在Euler示性数以及更广义的所谓示性类(characteristic class)方面的工作即现在所谓的陈类(Chern class)的光辉成就,在这时已经逐渐孕育和形成了。
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... 杂记参考文献第13章 示性类13.1 圆群G=S和对合G=Z的示性类13.2 酉群U(n)的示性类(陈类)与正交群O(n)的示性类(Stiefel-Whitney类)13.3 计算13.4 其它的讲法13.5 Pontrjagin 类13.6 K-群和陈特征标参考文献第14章 表示论通论14.1 引言14.2 一般概念14.3 紧群和...
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事实上,对于存储的类本身,这种实用方法的实用性开始变得明显,如清单8所示。
Actually, much of the utility method's utility become apparent when placed onto the stored class itself, as shown in Listing 8.
在图1所示的简单类图中,可以看出这两个类有几个关系(如果这种复杂性看起来不自然,请忍耐一下;这是有意义的!)
In the simple class diagram of Figure 1, you can see that the two classes share a few relationships (just bear with me if all this complexity seems contrived: it serves a purpose!)
黄色肉芽肿性肾盂肾炎(XGP)的特征是CT示群集的类圆形的低密度区以及环形增强带形成“熊掌征”;
The CT features of Xanthogranulomatous pyelonephritis(XGP)include multiple, rounded, low density areas with enhancing rings arranged in a hydronephrotic pattern known as bear paw sign.
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