Orbit space of $\mathbb{Z}_2$-action on the torus $T^2$
64060
Is it possible to obtain a sphere from a quotient of a torus?
58135
Quotient group $SL(2,\mathbb{R})/SO(2,\mathbb{R})$
143429
Kernel of ring homomorphism $k[X,Y] \rightarrow k[t^2, t^3]$
72211
Isomorphism involving Eilenberg-Maclane space, Tors.
27056
$ gl(2,\mathbb C) \cong sl(2,\mathbb C) \oplus \mathbb C $
111838
Prove that a standard torus is diffeomorphic to $ \mathbb S^1\times \mathbb S^1$
67460
Orientation on $\mathbb{CP}^2$
131890
Totally disconnected space that is not $T_2$
111814
Precise connection between complexification of $\mathfrak{su}(2)$, $\mathfrak{so}(1,3)$ and $\mathfrak{sl}(2, \mathbb{C})$
38130
Complex structure on $\mathbb{C}\mathbb{P}^2\# \dots \# \mathbb{C}\mathbb{P}^2$
36700
Quotient space of closed unit ball and the unit 2-sphere $S^2$
25728
A second isomorphism theorem for action on cosets
12764
$\Bbb RP^2$ as the union of a Möbius band and a disc
37635
Diffeomorphism group of the unit circle
15586
Volume of the torus with an integral
23156
Homotopy equivalence from torus minus a point to a figure-eight.
122665
Help finding the fundamental group of $S^2 \cup \{xyz=0\}$