Is every finite category identifiable with a directed multigraph? (and vice versa?)
33822
Is there a monoid structure on the set of paths of a graph?
67524
Direct products in the category Rel
139912
Complexity of finite group isomorphism problem
4383
Finitely generated monoids - how to show that there is not first order set axiomatizing them.
97254
What is the proof of permutations of similar objects?
147961
Characterizing simply connected spaces
117707
d-regular bipartite graph
100581
Extended permutations, how does it work mathematically if you keep adding categories?
99931
Number of connected graphs on labeled vertices, counted according to parity
34909
To what extent is a scheme morphism determined by its topological map?
80787
2-morphisms for 2-category: don't understand how to draw
34300
"Natural" categories where monomorphisms differ from injective morphisms
17470
Does path-connected imply simple path-connected?
25064
Proving the snake lemma without a diagram chase
93111
Finiteness of the Algebraic Closure
78609
On the identity map requirement in the definition of category
22424
Has this "generalized semidirect product" been studied?