If I have a relation "$\sim$" which is symmetric and transitive, can I say that it is reflexive?
42835
Example of a relation that is symmetric and transitive, but not reflexive
80626
Is this an equivalent formulation of "surjective" resp. "epimorphism"?
56512
Divisibility is transitive: $\ a\mid b\mid c\,\Rightarrow\ a\mid c$
107992
Bilinear form with symmetric "perpendicular" relation is either symmetric or skew-symmetric
89167
Cardinality of equivalence relations in $\mathbb{N}$
95106
If $Y|X \sim \mathcal{N}(0,1)$ then is $Y^2|X \sim \chi^2(1)$?
108028
Is there a bijection between the reals and naturals?
104634
Galois extension is (not) transitive
156178
Do counit-unit adjunctions have the expected universal properties?
40937
Is the set of partial order relations over $ \mathbb{N}$ countable?
84999
$\exp(A)$ is orthogonal iff $A$ is skew symmetric
14877
Why is this relation not transitive?
10858
Why isn't reflexivity redundant in the definition of equivalence relation?
18330
Does $R[x] \cong S[x]$ imply $R \cong S$?
151676
Being characteristic is transitive
18800
If A and B are symmetric is AB=BA true?
74377
Is the natural order relation on an idempotent semiring total/linear?