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近閱讀叶菲莫夫著高等几何学,發觉其中有几个定理,可作更直接的証明,茲介紹如下(本文所指頁数系俄文原著第三版).
Nearly reading Ye Feimov’s book on higher geometry, found that there are several theorems that can be used for more direct proofs, which are described as follows (page number referred to in this article is the third edition of the Russian original).