Counting The Number of Equivalence Relations on a Set
96086
Double Factorial: Number of possibilities to partition a set of $2n$ items into $n$ pairs
127596
Composition of equivalence relations
17363
Prove that the intersection of two equivalence relations is an equivalence relation.
82207
Number of Pairs of Subsets
1704
Define a relation and find its equivalence classes.
31392
Examples and Counterexamples of Relations which Satisfy Certain Properties
120252
Equivalences of bounded sets definitions
113065
Proving equivalences of statements equivalent to AC
89167
Cardinality of equivalence relations in $\mathbb{N}$
11342
Show that conguence $\bmod m\,$ is an equivalence relation
96025
Showing there is only one isomorphism between well ordered sets using transfinite induction
60231
Number of equivalence classes of matrices under switching rows and columns
92340
How many metrics are there on a set up to topological equivalence?
25769
Finding all posets on a set
128350
Number of non-decreasing functions between two finite sets
57822
Number of ways to choose two disjoint subsets of a set
117862
Number of partitions of an $n$-element set into $k$ classes