Existence of limits and colimits in a pointed category.
63574
small limits in the pointed category of a category with all small limits
50846
Is a set without limit points necessarily closed?
81929
d-metrizable spaces are sequential
52611
Your favourite application of the Baire Category Theorem
69103
$\limsup$ and cluster points
61616
category of linear maps
144362
The construction of a Vitali set
33767
Category of profinite groups
51786
Is every additive monofunctor between abelian categories left exact?
84114
Does there exist a surjective homomorphism from $(\mathbb R,+)$ to $(\mathbb Q,+)$ ?
6904
questions about extremal epimorphisms in category theory
68786
"This property is local on" : properties of morphisms of $S$-schemes
121945
Monomorphisms and Epimorphisms in the category of small categories
124003
Composition of adjoint functors
36248
A classical problem about limit of continuous function at infinity and its connection with Baire Category Theorem
102899
Category theory with objects as logical expressions over $\{\vee,\wedge,\neg\}$ and morphisms as?
155621
Finiteness of the dimension of a normed space and compactness