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magma
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12 votes
1 answer
473 views

Zorn's lemma in categorical language

7 votes
1 answer
1k views

Adjoint pairs, triplets and quadruplets

5 votes
1 answer
1k views

Rel: the category of relations

5 votes
2 answers
947 views

Two point topological space

5 votes
1 answer
489 views

Being a monomorphism described as a universal property

4 votes
1 answer
585 views

Definition of the Diagonal functor

4 votes
1 answer
158 views

Adjoint situation induced on presheaves

3 votes
0 answers
72 views

Size of the collection of morphisms of a category

2 votes
2 answers
189 views

Existence of non-identity natural transformations $\tau:F \to F $

1 vote
1 answer
56 views

SupLat and InfLat