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Using a standard fact in hyperbolic geometry, we give a simple proof of the uniqueness of PL minimal surfaces, thus filling in a gap in the original proof of Jaco and Rubinstein. Moreover, in order to...
2k-连通4k+2-维闭法架流形分类问题的一些讨论
2k-连通4k+2-维闭法架流形分类问题
2007/12/10
本文将从两个方面讨论2k-连通4k+2-维闭法架流形的分类问题:①证明 Kervaire 不变量和上同调环可完全确定此类流形的同伦型.②证明 Kervaire 不变量为零的2k-连通4k+2-维闭法架流形在相差一个同伦球的意义下微分同胚于高维环面.
Unique Factorisation for Commutative Rings Without Identity
Irreducibility associates unique factorisation
2010/3/5
This paper concerns the unique factorisation property in commutative rings not necessarily with identity. We give a new definition of irreducibility and associates in a commutative ring with 1 (crwl),...