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arXiv 2602.12239math.CT
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微小性与指数函子的右伴随

Tininess and right adjoints to exponentials

Centro de Investigación en Teoría de Categorías y sus Aplicaciones, A.C.(类别理论及其应用研究中心);Instituto de Matemáticas, Universidad Nacional Autónoma de México(墨西哥国立自治大学数学研究所)

Enrique Ruiz Hernández, Pedro Solórzano

AI总结:

本文研究了指数函子右伴随对象的微小性,通过分析其在拓扑范畴中的行为,探讨其在微分拓扑学中的基础意义。

摘要:

对象T其指数函子(-)^T存在右伴随(-)_T的现象被称为微小性。在集合范畴中,只有单元素集合满足这一条件,因此Lawvere认为这些对象应被称为『amazingly tiny』,即A.T.O.M.。本文探讨此类对象的直观微小性。通过分析其在拓扑范畴中的行为(子对象、商、 retract等)来验证其微小性。进一步在满足某些预协合条件的拓扑范畴中分析T及其(-)_T的拓扑行为(连通性、合同性、连通分量等),并将其与Lawvere在微分拓扑学中的基础提案进行比较。

英文摘要:

Objects $T$ whose exponential functor $(-)^T$ admits a right adjoint $(-)_T$ are known under different names. The fact that they exist, yet that the only set that satisfies this in the category of sets is the singleton made Lawvere suggest they ought to be ``amazingly tiny'' -- hence Lawvere's acronym ``A.T.O.M.'' This report explores how intuitively tiny any such object is. Evidences both in favor and to the contrary are produced by looking at their categorical behavior (subobjects, quotients, retracts, etc) when the ambient category is a topos. The topological behavior (connectedness, contractibility, connected components, etc) of both $T$ and $(-)_T$ is further analyzed in toposes that satisfy certain precohesive conditions over their decidable objects, where this tininess is tested against parts of Lawvere's foundational proposal for Synthetic Differential Geometry.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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