A non-normal variety that is regular in codimension one
5303
isolated non-normal surface singularity
19720
A normal subgroup intersects the center of the $p$-group nontrivially
101893
Is there a classification of regular maps $\mathbb{P}^1(k)\to\mathbb{A}^1(k)$?
140553
An ideal which is not finitely generated
118513
Ideal of product of affine varieties
57883
Example of a Subgroup That Is Not Normal
13066
A Zariski open subset of a variety has the same dimension as the variety.
28406
composition of certain covering maps
78873
How to show that the monomials are not a Schauder basis for $C[0,1]$
4192
Non-algebraically closed field in which every polynomial of degree $<n$ has a root
3296
Proof That $\mathbb{R} \setminus \mathbb{Q}$ Is Not an $F_{\sigma}$ Set
110832
$F_\sigma$-subsets in a normal space can be separated
6134
Some Subgroup of Dihedral Group is Normal
157488
Proving that $k[x,y,z]/(xz - (y^2 + 1))$ is a normal ring.
73419
For $f$ entire and $\{f(kz) : k \in \mathbb{C}\}$ a normal family, prove that $f$ is a polynomial.
63701
An example of a regular function over an open set
666
Prove that the upper half plane of Cartesian plane is not an affine variety