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高维代数IV:2-缠结

Higher-Dimensional Algebra IV: 2-Tangles

John C. Baez, Laurel Langford

摘要:

正如纽结和链环可以用代数方法描述为三维缠结范畴中的某些态射一样,光滑嵌入R^4中的紧致曲面也可以用“四维2-缠结”2-范畴中的某些2-态射来描述。利用Carter,Rieger和Saito的工作,我们证明了这个2-范畴是“在一个非框架自对偶对象上有约束的自由半严格辫子monoidal 2-范畴”.通过这个泛性质,任何在辫子幺半群2-范畴中的非框架自对偶对象都确定了4维2-缠结的不变量。

英文摘要:

Just as knots and links can be algebraically described as certain morphisms in the category of tangles in 3 dimensions, compact surfaces smoothly embedded in R^4 can be described as certain 2-morphisms in the 2-category of `2-tangles in 4 dimensions'. Using the work of Carter, Rieger and Saito, we prove that this 2-category is the `free semistrict braided monoidal 2-category with duals on one unframed self-dual object'. By this universal property, any unframed self-dual object in a braided monoidal 2-category with duals determines an invariant of 2-tangles in 4 dimensions.

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