翻訳と辞書 |
Crosscap number : ウィキペディア英語版 | Crosscap number In the mathematical field of knot theory, the crosscap number of a knot ''K'' is the minimum of : taken over all compact, connected, non-orientable surfaces ''S'' bounding ''K''; here is the Euler characteristic. The crosscap number of the unknot is zero, as the Euler characteristic of the disk is one. ==Examples==
*The crosscap number of the trefoil knot is 1, as it bounds a Möbius strip and is not trivial. *The crosscap number of a torus knot was determined by M. Teragaito. The formula for the knot sum is :
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Crosscap number」の詳細全文を読む
スポンサード リンク
翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|