The mystery of non-Hausdorff manifolds
A review of the least-discussed manifolds of all
Last updated : 2019-02-15 10:54:13
Geodesically complete incompleteness and the most awful spacetimes
How one can construct a geodesically complete spacetime with singularities
Last updated : 2018-11-14 10:07:16
All about $1$-manifolds
Last updated : 2018-11-13 11:56:06