Understanding light in 3 dimensions.
理解光的三个方面。
It is proved that the motion of the filament - like vortex is governed by a law of curvature flow in 3 dimensions.
证明了在3维情形,线状涡漩的运动服从一个曲率流方程。
You take a sphere, in 3 dimensions, you rotate around the center of the sphere, and all those rotations leave the sphere alone.
那一个三维的球来说,无论你怎样把它绕中心旋转,它都会保持不变。
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