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1蝴蝶定理的介绍蝴蝶定理是初等几何中的近代名题之一,它于1815年在西欧出版的杂志《男士日记》上问世.题目
1 The introduction of the butterfly theorem The butterfly theorem is one of the modern titles in elementary geometry, which was published in the journal Men’s Diary in Western Europe in 1815. Title