Number of reflexive relations, symmetric relations, reflexive and symmetric relations using digraph approach
74015
Number of relations that are both symmetric and reflexive
40937
Is the set of partial order relations over $ \mathbb{N}$ countable?
57466
Reflexive and relation
85507
Equivalence Relation problem
60231
Number of equivalence classes of matrices under switching rows and columns
89506
Union of disjoint sets : Equivalence relations
134938
Committee combinatorics
140335
Prove that the empty relation is Transitive, Symmetric but not Reflexive
98518
Cardinality of equivalence relations on N
19413
Degree sequence multigraph without loop
57954
How many transitive relations on a set of $n$ elements?
83434
Graph theory induction
29232
Find total number of relations that are equivalence as well as partial order set
33822
Is there a monoid structure on the set of paths of a graph?
65910
Reflexivity of equivalence relations
155259
Textbook on Graph Theory using Linear Algebra
65639
Existence of a self-complementary graph