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arXiv 1201.3789math.CTmath.GNmath.RA
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Span、Costan和其他双范畴

Span, Cospan, and Other Double Categories

Susan Niefield

摘要:

给定一个双范畴D,使得D_0有推出,我们刻画了D与Cosspan(D_0)之间的oplax/lax映射,使得D_0上的右伴随是正规的并限制于D_0上的恒等式,其中Cosspan(D_0)表示D_0上垂直态射是cosspan的双范畴.我们证明了这样一对存在当且仅当D有同伴,conjoints,和1-cotabulator。右伴随由伴随和结合诱导,左伴随由1-余表诱导。1-余表子的概念是模的对称代数和拓扑、局部和拓扑空间的Artin-Wraith胶合的一个普通推广。在此基础上,我们得到了具有伴随和结合的双范畴的一个特征,即D_0上的单位函子扩张到从Cosspan(D_0)到D的正规Lax函子。

英文摘要:

Given a double category D such that D_0 has pushouts, we characterize oplax/lax adjunctions between D and Cospan(D_0) such that the right adjoint is normal and restricts to the identity on D_0, where Cospan(D_0) denotes the double category on D_0 whose vertical morphisms are cospans. We show that such a pair exists if and only if D has companions, conjoints, and 1-cotabulators. The right adjoints are induced by the companions and conjoints, and the left adjoints by the 1-cotabulators. The notion of a 1-cotabulator is a common generalization of the symmetric algebra of a module and Artin-Wraith glueing of toposes, locales, and topological spaces. Along the way, we obtain a characterization of double categories with companions and conjoints as those for which the identity functor on D_0 extends to a normal lax functor from Cospan(D_0) to D.

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