Affine open for arbitrarily chosen 2 points on a scheme
124036
Open affine neighborhood of points
58471
Accumulation points of uncountable sets
57644
Lower bounds for ${{2n} \choose {n}}$
73130
A simple question about open set
33014
Bijection between an open and a closed interval
51313
Extension of linearly independent set to a basis in an infinite dimensional vector space
84394
Choice function for a collection of nonempty subsets of $\{0,1\}^\omega$
18950
Show that $f$ has at most one fixed point
59207
How to create the most compact mapping n → isprime(n) up to a limit N?
54690
Proving normality of affine schemes
17276
Number of points in the fibre and the degree of field extension
152927
seemingly nontrivial question about covering maps and evenly covered open sets
38033
A surjective linear map into a finite dimensional space is open
129997
Unique line in $\mathbb{P}^3$ through a point $p$ and intersecting two disjoint lines
91545
A stronger version of discrete "Liouville's theorem"
97810
bijective morphism of affine schemes
147429
Set of points in $\mathbb{C}$ s.t. $z^{n-1} = \overline z$