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References to 'disjoint union of categories'
1. alternative treatment of concatenation by rspuzio
2. category of small categories by CWoo
3. cell attachment by yark
4. connected category by CWoo
5. connected poset by CWoo
6. covering space by rmilson
7. direct limit of algebraic systems by CWoo
8. direct limit of sets by CWoo
9. enumerative combinatorics by mps
10. face of a convex set by CWoo
11. hedgehog space by mathcam
12. neighborhood system on a set by CWoo
13. power of an object by CWoo
14. properties of direct product by CWoo
15. properties of pullback by CWoo
16. simplicial category by mhale
17. subsheaf of abelian groups by jirka
18. topological sum by rspuzio
19. topos by CWoo
20. \'Etal\'e space by guffin