Re: [分析] 想問微分幾何的問題
一般說到同胚大家喜歡舉甜甜圈跟馬克杯的例子
不過我個人比較偏好
這個
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跟這個
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同胚唷
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◆ From: 24.12.185.108
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09/20 23:40, , 1F
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因為一般書上會把同胚講成"從一個東西連續地變成另一個東西"
使得字面上我們會把它想成.....同倫
這個例子告訴我們同胚的定義其實比想像中還要寬鬆
另外就是,在數學裡面當我們講 manifold 的時候,實務上會想成
好像嵌在某個背景空間,但這個例子告訴我們背景空間是處於定義之外
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※ 編輯: WINDHEAD 來自: 24.12.185.108 (09/21 00:37)
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