An exercise in Gathmann's lecture notes about Projective spaces
129997
Unique line in $\mathbb{P}^3$ through a point $p$ and intersecting two disjoint lines
48557
Product of connected spaces
57653
Relation between line bundles over $\mathbb{P}^1$ in geometry and topology
40256
Why are these two descriptions of real n-dimensional projective space  the same?
51465
New, elegant proofs for $\varphi(p^{k})=p^{k}-p^{k-1}$
59289
Nested Sequence of Topological Space and the Coherent Topology; Munkres Topology 35.9
154076
How to show this property of $\mathbb{RP}^{n}$.
29655
$L^p$ and $L^q$ space inclusion
52992
Proving that P/PJ is a projective right module over R/J
89264
Connectedness in the Quotient Space
134840
Generators and relations for $\text{PSL}(2, \mathbb{F}_q)$
62603
Characterizations of the $p$-Prüfer group
90525
The subspace of $\ell_2$
34173
Banach spaces and their unit sphere
110018
Conjugacy classes in $A_n$.
65333
Weighted projective space and projective space are isomorphic
95513
Proving $W$ is a subspace of $P_{2}$