注意:雖然這裡是上升第二指數(raising the second index),不過對第一指數上升也會得到相同結果。
注意:雖然這裡是上升第二指數(raising the second index),不過對第一指數上升也會得到相同結果。
{{Refbegin|30em}}
*{{cite book
| last = Chern
| first = Shiing-Shen. | authorlink = Richard L. Bishop
|author2=W. H. Chen
author3=K.S. Lam
| title = Lectures on Differential Geometry
| year= 1980
| publisher = World Scientific
| isbn = 978-9810241827
| origyear = 1999
}}
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