How would I do this?
Do I separate it into partitions first? or do I order it by $(1,1)(1,2)(1,3)(2,1)$... etc.
How would I do this?
Do I separate it into partitions first? or do I order it by $(1,1)(1,2)(1,3)(2,1)$... etc.
There's a one-to-one correspondence between equivalence relations and partitions, so you can certainly do it by carefully writing down all the ways to partition $\lbrace1,2,3\rbrace$ into subsets.