截,切断,割开。量词,表示节、段根据隶定字形解释。形声。字从“土戈”(zāi),从隹,“土戈”亦声。“土戈”指“在原野上已排列停当的军阵”。“隹”即鸟儿。
It is only with Thom,R. 's paper ,published in 1963,that envelope theory has been cleared up by Singularity Theory,Thom showed that the only generic singularities of envelopes of 1-parameter families of plane curves are semicu-bic cusps and transversal selfintersections.
1963年Thom,R.开始用奇点理论来研究包络理论,Thorn给出了平面的1-参数曲线族的包络的一般奇点是半抛物尖点和横截自相交点。
参考来源 - 单参数曲面切族芽的奇点理论·2,447,543篇论文数据,部分数据来源于NoteExpress
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