纖維叢 - 中國大百科智慧藏
203.68.243.199/cpedia/Content.asp?ID=43552頁庫存檔
乘積叢恆有截面﹐然而由於一般的叢有扭曲﹐截面不一定存在。例如二維球面的單位切向量所構成的叢沒有截面﹐即球面上切向量場必有奇點。 示性類纖維叢的截面 ...WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.
Copyright ©1998-2025 wenxuecity.com All rights reserved. Privacy Statement & Terms of Use & User Privacy Protection Policy