Partitions of sets, Bell number, and equivalence relations
59727
Understanding equivalence class, equivalence relation, partition
141531
Find the set of $n\in\Bbb Z^+$ with $M=\{n,n+1,n+2,n+3,n+4,n+5\}$ partitionable into two sets
42603
How can I prove that the cadinality of a set minus a finite number of elements of it is still the same as the original set?
70327
the numer of partial function between two sets in combinatoric way
85338
Equivalence relations on classes instead of sets
18018
Proving that $4 \mid m - n$ is an equivalence relation on $\mathbb{Z}$
153651
Countable partition in atoms
150064
Cardinality of "$x-y\in\Bbb Q$"-equivalence class of $1/\sqrt2$
28453
Finding all partitions of a set
1643
Number of reflexive relations defined on a set A with n elements
107614
Partitioning an infinite set
107964
Simple combinatorics problem.
57954
How many transitive relations on a set of $n$ elements?
151935
Proving the predicate $\forall n \in \mathbb{N} , n \geq 2$ using the Pigeonhole principle
111954
Computing the cardinality of a combinatorial set
89506
Union of disjoint sets : Equivalence relations
72750
Uncountable number of mutually disjoint countable sets in $\mathbb R$