图的基本群胚
Fundamental Groupoids for Graphs
摘要:
本文给出了图的一个$\times$-同伦基本广群,并证明了它与图的2-范畴之间的函子关系。我们进一步探讨了图积的基本广群,并给出了一个尊重图积的广群积。对这些群胚给出了一个van Kampen定理。最后,我们推广了以前的工作,一个基本群的图形,开发一个循环行走广群,并显示连接到多面体复杂的图态射。
英文摘要:
In this paper, we develop a $\times$-homotopy fundamental groupoid for graphs, and show a functorial relationship to the 2-category of graphs. We further explore the fundamental groupoid of graph products and develop a groupoid product which respects the graph product. A van Kampen Theorem for these groupoids is provided. Finally, we generalize previous work on a fundamental group for graphs, developing a looped walk groupoid and showing a connection to the polyhedral complex of graph morphisms.
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