The formula of the curve tangent slope at some peculiar point in the orthograph on the stereoscopic surface intersecting line and the method of making tangent are given as well.
本文通过
展
的微分不变量,

展
的

与
特征,并以锥
和切

为例阐明这些特性的几何意义。
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Superclusters themselves aren't just randomly distributed through the Universe either: they appear to fall along tremendously long interconnected and intersecting filaments, making the Universe appear almost foamy on the biggest scales, like a sponge.
它们似乎是沿着非常长、相互联系、相互
叉
细丝落下
,使宇宙从最大
尺度上看几乎像泡沫状
,就像海绵一样。
故事