配邊
此條目需要精通或熟悉相關主題的編者參與及協助編輯。 (2020年2月2日) |
在數學中,配邊(英文:cobordism 來自法文的 bord)是緊流形的等價關係。它使用邊界的拓撲概念。若兩個流形M和N的不交並是另一個流形W的邊界,那麼M和N這兩個流形是配邊的。此外M和N的配邊是W:
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例子
編輯最簡單的例子是區間 I =[0,1]。這是 {0}和{1}這兩個0-維流形的1-維配邊。
如果M 是圓,N是兩個圓, 那麼M 和 N 的不交並是pair of pants(W)的邊界。所以pair of pants是M和N的配邊。
參見
編輯腳註
編輯- ^ 若M和N是 維的,則W是 維的,而且這是 維的配邊。
參考文獻
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