Example where supp(M) is not Zariski-closed
2868
The support of a module is closed?
20437
Closed surjection that does not preserve regularity
98391
example of a nonempty subset is closed under scalar multiplication but not a subspace
144858
Example of quasi-compact, non-quasi seperated scheme where qcqs fails?
94397
Example of a non-splitting exact sequence $0 → M → M\oplus N → N → 0$
133086
When Cantor's Intersection theorem won't work with closed sets
47320
An example of almost sure finite random time S such that $W_t=B_{S+t}-B_S$ is not a brownian motion
35230
How to find fixed points for DES weak keys
76597
Examples of provably${}^n$ unprovable statements
132595
$\sup_{0 \leq M \leq I_{\mathcal{H}_1}} \frac{\operatorname{Tr}[\rho M]}{\operatorname{Tr}[\sigma M]}$ satisfies Data Processing Inequality
51037
How do I find out which process is preventing a umount?
110726
Example of a non-gcd domain
37654
Topology: Example of a compact set but its closure not compact
72185
The negation of a limit condition, Spivak style.
12639
Example of primitive function which isn't Riemann-integrable on a closed interval [0,1]
77735
When $\Bbb Z_n$ is a domain. Counterexample to $ab \equiv 0 \Rightarrow a\equiv 0$ or $b\equiv 0\pmod n$
59872
How to prove $\inf(S)=-\sup(-S)$?