Does $\mbox{Im}\left ( z \right )\geq 0$ define an affine algebraic variety?
666
Prove that the upper half plane of Cartesian plane is not an affine variety
128550
Algebraic field extension and intermediate integral domain
81550
Linking two theorems: on algebraic closure and on minimal splitting field
47266
Every affine variety in $\mathbb A^n$ consisting of finitely many points can be written as the zero locus of $n$ polynomials
83595
Proving that $\mathbb{A}=\{\alpha \in \mathbb{C}: \alpha \text{ is algebraic over } \mathbb{Q} \}$ is not a finite extension
54690
Proving normality of affine schemes
41895
Show $\text{Hom}_{Ab}(A,\mathbb{Q}) = \{0\}$ for finite $A$
157597
Homeomorphism between $\mathbb{Q}$ and $\mathbb{Q}(>0)$, and $\mathbb{Q}(\ge 0)$
78873
How to show that the monomials are not a Schauder basis for $C[0,1]$
152274
An exercise from Conway's Complex Analysis on an application of Schwarz's Lemma
121986
Do the Laurent polynomials over $\mathbb{Z}$ form a principal ideal domain?
108372
Milne Algebraic Geometry - Remark 3.14 confusion
108156
Algebraic closure of $\mathbb{C}(x)$ is isomorphic to $\mathbb{C}$
20612
Is fibre product of varieties irreducible (integral)?
11319
Is $M=\{(x,|x|): x \in (-1, 1)\}$ not a differentiable manifold?
15137
Does $IJ=IK\implies J=K$ always hold for integral domain and finitely generated nonzero ideal $I$?
127198
What is $\mathbb{C}^{Aut(\mathbb{C}/\mathbb{Q})}$?