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Results tagged with higher-category-theory
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user 117693
For questions involving one or more categorical dimensions, or involving homotopy coherent categorical structures.
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answer
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HNN-extension as a 2-colimit
In the spirit of this question, it would be interesting to give a characterization of HNN extensions as a 2-colimit. If $G$ is a group and $\alpha:H \xrightarrow{\cong} K$ is an isomorphism between tw …
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