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... "
Sophie Hyman nodded solemnly.
Pang Xuelin couldn't help crying and laughing. The students themselves are quite confident.
The Hopf conjecture is one of several conjecture statements proposed by the German mathematician Hopf in differential geometry and topology in 1931, and is also an open problem in the overall Riemannian geometry.
Almost a hundred years ago, no mathematician can prove it.
The simple expression of this conjecture is: For a compact and boundl ...
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