Example of a morphism that is not a function
30597
Morphism that is not a mapping
89749
Example of a not recursively enumerable set $A \subseteq \mathbb{N}$
15128
Example of non-decomposable ideal
120496
Examples of Non-Noetherian Valuation Rings
112306
Two manifolds $X$ and $Y$ with two bijective continuous functions from $X$ to $Y$ and $Y$ to $X$, but not homeomorphic
129623
A shrinking map that is not a contraction no fixed point.
34798
Example of element of double dual that is not an evaluation map
9074
Example of non-isomorphic structures which are elementarily equivalent
156839
Functions Which are non differentiable on a Given Set.
145017
Example of a function $f$ which is nowhere continuous but $|f|$ should be continuous at all points
111689
Surjective, but not injective endomorphism
12639
Example of primitive function which isn't Riemann-integrable on a closed interval [0,1]
80260
Can it happen that the image of a functor is not a category?
27775
Proving a function is not a contraction
11541
Examples of a non-commutative division ring
123132
Counterexample for a non-measurable function?
42714
A diagram which is not the torus