# Equivalence classes

**URL:** <https://forum.kirupa.com/t/equivalence-classes/191654>\
**Category:** Uncategorized\
**Created:** [June 22, 2006, 2:48am UTC](https://forum.kirupa.com/t/equivalence-classes/191654 "2006-06-22T02:48:43Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![kdd](https://avatars.discourse-cdn.com/v4/letter/k/ecb155/32.png) [@kdd](https://forum.kirupa.com/u/kdd)\
**Post date:** [June 22, 2006, 2:48am UTC](https://forum.kirupa.com/t/equivalence-classes/191654/1 "2006-06-22T02:48:43Z")

</div>

i’ve a problem, and i’ve no idea how to solve it:  
let E = {(1,1),(1,2),(2,1),(2,2),(3,3),(4,4)} on {1,2,3,4}  
list its equivalence classes.

how do i do this? please explain… thanks.