Example of compact riemannian manifolds with seccional curvature negative
36519
Explicit example of a compact manifold of dimension $>2$ with strictly negative sectional curvature
154009
Closed, simply connected manifolds which are not spheres
133413
Proof of paracompactness of CW-complexes (J. Lee, Introduction to Topological Manifolds)
40293
Understanding the definition of norm of tensors on a Riemannian manifold
62766
Topological Manifolds & Covers
80418
The "Easiest" non-smoothable manifold
50587
Example of a domain in R^3, with trivial first homology but nontrivial fundamental group
93314
At what point is the curvature of $y=-\ln(x)$ maximal?
147547
Any example of manifold without global trivialization of tangent bundle
113385
Example of $f,g: [0,1]\to[0,1]$ and Riemann-integrable, but $g\circ f$ is not?
99755
Non-orientable 1-dimensional (non-hausdorff) manifold
132911
Determining if there can be smooth closed geodesic given its curvature
116659
Manifold that is NOT smooth
59833
Isometric embedding of Schwarzchild metric in $\mathbb{R}^4$
146215
Metric on a Quotient of the Riemann Sphere
143254
Closed ball not a manifold.
96887
Dimension of isometry group of complete connected Riemannian manifold