An example of smooth but not Riemannian
31561
Is there a Smooth Real Manifold which is not a Riemannian Manifold?
128410
Showing that the set of fixed points is a smooth manifold
42774
Examples of involutions on $\mathbb{R}$
154009
Closed, simply connected manifolds which are not spheres
83230
A useful illustration for differential geometry
140618
An example of a sequence of Riemann integrable functions $(f_n)$ that converges pointwise to a function $f$ that is not Riemann integrable.
46504
Does there exist a smooth approximation of $x \bmod y$?
12639
Example of primitive function which isn't Riemann-integrable on a closed interval [0,1]
130180
Smooth function with all derivatives zero
112306
Two manifolds $X$ and $Y$ with two bijective continuous functions from $X$ to $Y$ and $Y$ to $X$, but not homeomorphic
99755
Non-orientable 1-dimensional (non-hausdorff) manifold
19984
Example of topological spaces with continuous bijections that are not homotopy equivalent
26379
What is non-manifold geometry?
62581
What is an example that a function is differentiable but derivative is not Riemann integrable
130211
Non-linear differential equation example
73662
Example of non-flat modules
83915
Showing that a function is not differentiable