What is identity arrow in the category Set?
46875
The identity morphism in $\mathbf{Set}$ is the identity function
97662
Is Category Theory similar to Graph Theory?
18561
Arrows describing matrix
53772
What's the explicit categorical relation between a linear transformation and its matrix representation?
82156
Supertype/Subtype deciding between category: complete disjoint or incomplete overlapping
74839
Catalan numbers: bijection between applications of a binary operator and Dyck words.
109649
idempotents acting as local identities
122110
Character of the subobject classifier in the topos of $\mathbf{M}$-sets.
106370
How do we construct the coslice category $C / \bf{C}$ given $\textbf{C}/C$ and prove that the two are equal?
74924
identity element of $(D_n ,\gcd)$
125174
Combinatorial intuition of identity
40793
What is the difference betwen equivalence and isomorphism of functors in categories.
115699
How exactly does Knuth's Up-Arrow notation work?
106414
Classifying whether a collection of objects is a set
83744
is there a property of a category that is preserved by category isomorphism, but not equivalence?
50363
Why does operators bl_idname have to contain 1 dot?
44100
Prove that identity element is unique