- 作者: 施皓耀
- 作者服務機構: 國立彰化師範大學數學系
- 中文摘要: 本文旨在探討3維度流形中可互為覆蓋性質流形之間的關係。在1967年,Charlap證明了兩個非同構(non-homeomorphic)的無曲度流形(flat manifolds)M, N使得與為同構。但,Charlap所給的例子中M,N的維度均大於37。在1972年Conner跟Raymond提供了一種建構流形的方法,並證明了具方向性的3維度封閉流形, 使得可以與同構的充分條件。在1993年,Shy證明了上述問題的必要條件。在本文中,我們分析了與中流形之間的性質性而證得在與的條件下,與是可以互為覆蓋的,亦即可以看成的k層覆蓋空間且可以看成的m層覆蓋空間。
- 英文摘要: Charlap in 1967 gave the first example of non-homeomorphic flat manifolds M and N such thatis homeomorphic to, where M,N are of dimension greater than 37. In 1972, Conner and Raymondgave a sufficient condition for closed orientable 3-manifolds, so that is diffeomorphic to. In 1993, Shy completed the above classification problem by giving the necessary condition. Inthis paper, we show that closed orientable 3-manifolds and with diffeomorphic to admitthe property that and may cover each other. More precisely, is a k-fold covering of, andis an m-fold covering of.
- 中文關鍵字: covering property; Seifert manifolds; low-dimensional manifolds
- 英文關鍵字: --