Knots and Links
《Knots and Links》 · 第 55 页 · §3.3
Tait called such crossings nugatory (meaning unimportant or worthless): they can clearly be removed by untwisting and turning over part of the diagram.
Knots and Links
《Knots and Links》 · 第 55 页 · §3.3
Tait called such crossings nugatory (meaning unimportant or worthless): they can clearly be removed by untwisting and turning over part of the diagram.
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