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References to 'zero object'
1. $C_2$-category by bci1
2. 2-category by bci1
3. abelian category by djao
4. abelian groups form an abelian category, proof that by mps
5. algebraic categories without free objects by Algeboy
6. alternative definition of category by rspuzio
7. beyond formalism: G\"{o}del's incompleteness by gribskoff
8. Cartesian closed category by CWoo
9. categorical pullback by CWoo
10. category of fractions by CWoo
11. category of pointed topological spaces by mathcam
12. category of small categories by CWoo
13. complete category by CWoo
14. connected category by CWoo
15. discrete category by CWoo
16. empty product by pahio
17. examples of initial objects and terminal objects and zero objects by AxelBoldt
18. free objects in concrete categories by joking
19. functions from empty set by rspuzio
20. group object by rspuzio
21. index of category theory by rspuzio
22. kernel of a morphism by CWoo
23. limit of a functor by CWoo
24. limiting cone by CWoo
25. n-category by bci1
26. natural numbers object by mps
27. null graph by mathcam
28. power of an object by CWoo
29. preadditive category by CWoo
30. properties of direct product by CWoo
31. relation between pullbacks and other categorical limits by CWoo
32. simplicial category by mhale
33. subobject classifier by CWoo
34. symmetric monoidal category by CWoo
35. topos by CWoo
36. universal mapping property by MichaelMcCliment
37. well-pointed topos by mps