An example of a domain whose complement has a different boundary
47056
Show that the boundary of a set equals the boundary of its complement
90599
Trouble with proving $A$ is an integrally closed domain $\Rightarrow$ $A[t]$ is integrally closed domain
128481
Can two different topological spaces cover each other?
111064
Example of a bounded lattice that is NOT complete
13174
Show that $A[X]/(aX+b)$ is an integral domain
64261
example of not surjective isometry on a bounded not closed set.
118048
Can a function with just one point in its domain be continuous?
136592
Examples of manifolds that are not boundaries
131847
$\frac{(x-1)(x+1)}{ (x+1)} \rightarrow (x-1)$ Domain Change
11259
Prove $R\times S$ is not an integral domain
153204
Euclidean domain $\mathbb{Z}[\sqrt{d}]$
45363
Show that both mixed partial derivatives exist at the origin but are not equal
150468
Example of two open balls such that the one with the smaller radius contains the one with the larger radius.
157960
How can I prove the existence of two values in a given domain Mean value theorem?
67699
Integral domain that is integrally closed, one-dimensional and not noetherian
93694
Boundary behaviour of holomorphic function on unit disk
43504
Proving the existence of a complement subspace $U' \subset V$.