Can there be an example of infinitely many, non-repeating mutually adjoint functors?
53634
Sequences or 'chains' of adjoint functors
51786
Is every additive monofunctor between abelian categories left exact?
101095
Constructing an example s.t. $\operatorname{Hom}_R(M,N)$ is not finitely generated
6646
A (non-artificial) example of a ring without maximal ideals
136210
There is more than one functor that fix objects in category of groups?
91129
Can there be an onto homomorphism from a ring without unity to a ring with unity?
92677
Infinite algebraic extension of a finite field
137907
Composing functors with natural transformations
119888
Is it possible to convert $\forall$ quantifiers to $\exists$ quantifiers without negation?
41180
Arbitrary products of quasi-coherent sheaves?
66134
Sufficiently many idempotents and commutativity
52429
Explicit countable elementary extension of $\mathbb{N}$
117133
Is there an infinite countable $\sigma$-algebra on an uncountable set
10679
Equivalence of Categories and of Their Functor Categories
122121
Is there a vector space that cannot be an inner product space?
4800
Is there a name for an algebraic structure like this?
117131
Canonical Isomorphism Between $\mathbf{V}$ and $(\mathbf{V}^*)^*$