刚性理论是子流形几何中久盛不衰的重要方向，其根源可追溯到经典曲面论的高斯绝妙定理。
Rigidity theory is one ever-flourishing subject in geometry of submanifolds, which can be traced back to Gauss' Theorema Egregium in the classical theory of surfaces.
格雷泽所给出的这个证明至少与定理本身一样绝妙，而且使人更加惊奇。
The proof which is due to Glazer, is at least as beautiful as the theorem and it is considerably more surprising.
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