===== Opposite category =====
==== Category ====
| @#55CCEE: context     | @#55CCEE: ${\bf C}$ ... category |
| @#FFBB00: definiendum | @#FFBB00: ${\bf C}^\mathrm{op}$ |
| @#FF9944: definition  | @#FF9944: $\mathrm{Ob}_{{\bf C}^\mathrm{op}}:=\mathrm{Ob}_{\bf C} $ |
| @#FF9944: definition  | @#FF9944: ${\bf C}^\mathrm{op}[A,B]:={\bf C}[B,A]$ |
| @#FF9944: definition  | @#FF9944: $f\,\circ_{{\bf C}^\mathrm{op}}\,g\ :=\ g\,\circ_{{\bf C}}\,f$ |

==== Discussion ====
=== Reference ===
Wikipedia: [[http://en.wikipedia.org/wiki/Opposite_category|Opposite category]]
==== Parents ====
=== Context* ===
[[Categories]]
=== Element of ===
[[Categories]]