Proving that the connect sum of 3 copies of $\mathbb{C}P^2$ does not have a complex structure
38130
Complex structure on $\mathbb{C}\mathbb{P}^2\# \dots \# \mathbb{C}\mathbb{P}^2$
85987
Prove that $k[x,y,z,w]/(xy-zw)$, the coordinate ring of $V(xy-zw) \subset \mathbb{A}^4$, is not a unique factorization domain
37084
Do two distinct level sets determine a non-constant complex polynomial?
96380
Representation of $\text{sl}(2,\mathbb{C})$
156666
Complex conjugated representation and its Young tableaux
105666
What's an easy way to show that $GL(n,\mathbb C)$ is connected?
125668
A proof that BS(1,2) is not polycyclic
79425
Prove the direct product of nonzero complex numbers under multiplication.
79056
Prove that $\mathbb Z^n$ is not isomorphic to $\mathbb Z^m$ for $m\neq n$
143113
Non-inductive, not combinatorial proof of $\sum_{i \mathop = 0}^n \binom n i^2 = \binom {2 n} n$
102084
How to show path-connectedness of $GL(n,\mathbb{C})$
103763
Minimal polynomial of $\sqrt{2}+\sqrt{3}$ over $\mathbb Q$
48127
Are there infinitely many $A\in \mathbb{C}^{2 \times 2}$ satisfying $A^3 = A$?
137285
Prove $\mathbb{Z}_2 \times \mathbb{Z}_2$ is not isomorphic to $\mathbb{Z}_4$
16860
set of almost complex structures on $\mathbb R^4$ as two disjoint spheres
109610
Is $\mathbb{R}[X]/(P)$ isomorphic to $\mathbb C$ for every irreducible polynomial $P$ of degree $2?$
150310
A finite sum of reciprocals of complex numbers cannot be confined to a half-plane