Endofunctors of $\textsf{FinVec}$ which are not $C^n$
41261
Functors that aren't continuous/smooth
95942
$k[x]/(x^n)$ module with finite free resolution is free
149416
Show that $ \{\lnot,\leftrightarrow\} $ is not functional complete
124864
A not free $\mathbb{Z}$-module
155266
Is $\exp:\overline{\mathbb{M}}_n\to\mathbb{M}_n$ injective?
128711
$(\Bbb Z\oplus \Bbb Z)[X] \not\cong \Bbb Z[X]\oplus \Bbb Z[X]\,$?
123242
Half exact functor which is neither right exact nor left exact
41363
when is f@g not the same as f[g]?
98391
example of a nonempty subset is closed under scalar multiplication but not a subspace
36747
$\text{Tor}_0^R(M,N)\simeq M\otimes_R N$
121593
Symmetric and exterior power of representation
122121
Is there a vector space that cannot be an inner product space?
151251
A simple algebra that is not semisimple
118898
Is there a simple way of proving that $\text{GL}_n(R) \not\cong \text{GL}_m(R)$?
61674
Coker of powers of an endomorphism
140553
An ideal which is not finitely generated
125668
A proof that BS(1,2) is not polycyclic