定向配邊類(oriented cobordism class)是流形的一種等價類,對於兩個光滑緊定向n維流形M與M′,若存在一個光滑緊的帶邊的定向流形X,使得∂X及其誘導定向在保持定向的同胚之下同胚於M與(-M′)的無交並,則稱M與M′屬於同一個定向配邊類。定向配邊類的這種關係是自反的、對稱的和傳遞的,因此是一個等價關係,在這種等價關係之下的等價類之集記為Ωn,對Ωn中的任意兩個元素{M},{M′},用無交並作為群運算,則Ωn構成一個阿貝爾群,這個群的零元就是空流形的配邊類。例如,可以列出定向配邊類群如下:Ω0≅Z,Ω1=0,Ω2=0,Ω3=0,Ω4≅Z,Ω5=Z/2,Ω6=0,Ω7=0,Ω8≅Z⊕Z,Ω9=(Z/2)⊕(Z/2),Ω10≅Z/2,Ω11≅Z/2。
基本介紹
- 中文名:定向配邊類
- 外文名:oriented cobordism class
- 所屬學科:數學
- 所屬問題:流形上的分析(示性類理論)
- 相關概念:定向流形,配邊理論等
基本介紹
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相關理論
托姆基本定理
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結構定理
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定向配邊不變數
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