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over_category [2015/03/18 17:11] nikolaj |
over_category [2015/03/18 17:16] nikolaj |
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| + | === Elaboration === | ||
| + | Given a (target) object $T$ in any category ${\bf C}$, the over category ${\bf C}/T$ has objects all arrows into $T$, and arrows all forwardings of their domains (there is one for each commutative triangle). | ||
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| === Reference === | === Reference === | ||
| nLab: [[http://ncatlab.org/nlab/show/overcategory|Overcategory]] | nLab: [[http://ncatlab.org/nlab/show/overcategory|Overcategory]] | ||
