What are some interesting sole exceptions or counterexamples?
51278
Theorems with an extraordinary exception or a small number of sporadic exceptions
116112
Examples of 'almost' vector spaces where unitary law fails
131385
How to provide a counterexample for if $n$ is prime, then $2^n -1$ is prime
105702
What is a simple example of a limit in the real world?
139964
Better exception for non-exhaustive patterns in case
36575
A first chance exception
133337
A little integration paradox
76597
Examples of provably${}^n$ unprovable statements
41067
For "another" example
118858
Is there any way to negate a Predicate?
4434
"Least Astonishment" and the Mutable Default Argument
48904
Opposite of Alternatives
31392
Examples and Counterexamples of Relations which Satisfy Certain Properties
113214
When to throw an exception?
16275
Example of a simple module which does not occur in the regular module?
49453
Why do I have to solve for $x$ in this proof, if I choose not to find a counterexample?
78300
Showing a set is closed other than giving a counterexample?