===== Quotient set =====
==== Set ====
| @#55CCEE: context     | @#55CCEE: $X$ ... set |
| @#55CCEE: context     | @#55CCEE: $ \sim\in\text{Equiv}(X) $ |
| @#FFBB00: definiendum | @#FFBB00: $ Y\in X/\sim $ |
| @#55EE55: postulate   | @#55EE55: $ \exists x.\ Y=[x]_\sim $ |

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=== Reference ===
Wikipedia: [[http://en.wikipedia.org/wiki/Equivalence_class|Equivalence class]]

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=== Context ===
[[Equivalence class]]