In 1976, Haken and Appel gave the first proof, which later was improved by Robertson. First, they show every planar triangulation contains one of the configurations in their unavoidable set.

  • 是一个可与费马猜想相媲美的难题,直到1976年才由哈肯和阿佩尔给出了第一个证明,随后Robertson等人对他们的方法进行了改进。

  • 互联网摘选 2025-01-19 23:48:25

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