What are some intuitive examples of categories which aren't made from structured sets and functions between them?
30597
Morphism that is not a mapping
128544
What are the subcategories of ordered sets / groups?
87983
Examples of Separable Spaces that are not Second-Countable
41937
Can one construct a non-measurable set without Axiom of choice?
40793
What is the difference betwen equivalence and isomorphism of functors in categories.
102899
Category theory with objects as logical expressions over $\{\vee,\wedge,\neg\}$ and morphisms as?
106370
How do we construct the coslice category $C / \bf{C}$ given $\textbf{C}/C$ and prove that the two are equal?
57071
Examples of Recursive functions
44160
Set theory: difference between belong/contained and includes/subset?
87580
Canonical examples of inner product spaces that are not Hilbert spaces?
58967
Is There a Difference Between Taxonomies and Categories?
137907
Composing functors with natural transformations
135656
Why non-measurable sets exist?
81122
interaction between mathematical structures
136592
Examples of manifolds that are not boundaries
34798
Example of element of double dual that is not an evaluation map
90826
Constructing a subset not in $\mathcal{B}(\mathbb{R})$ explicitly