What concept does a natural transformation between two functors between two monoids viewed as categories correspond to?
55778
Group theoretic meaning of natural isomorphisms between certain functors
148569
Embeddings $A → B → A$, but $A \not\cong B$?
132137
Concrete Categories Where Epis are Just Surjections
110059
$A^A$ in category of graphs
135369
Equivalence between derived categories preserve distinguished triangles
80787
2-morphisms for 2-category: don't understand how to draw
28154
Riehl's Category Theory in Context - Exercise 2.1.iv.
106370
How do we construct the coslice category $C / \bf{C}$ given $\textbf{C}/C$ and prove that the two are equal?
74377
Is the natural order relation on an idempotent semiring total/linear?
70797
Why doesn't the definition of a category require an explicit notion of morphisms equality?
155421
Tensor product of monoids and arbitrary algebraic structures
137907
Composing functors with natural transformations
21610
The monoid of fractions associated with the submonoid of cancellable elements of a commutative monoid E
122559
Some questions on abelian category
94246
Category-theoretic limit related to topological limit?
36139
Size of a natural transformation and the Yoneda Lemma
124003
Composition of adjoint functors