Hi, Since i will not be asking for assistance in a particular problem, i am posting under "General Math" rather than "Topology". If inappropriate, please move it somewhere else. As the title suggests, i am interested in reading more about Topological spaces that are NOT Hausdorff, but there seem to be very little on this topic out there, at least compared to what i was able to find about Hausdorff spaces. So, i was wondering whether you could provide me with some sources, like articles, books etc. that talk exclusively about non-Hausdorff spaces. I have been able to find a few things, but i was wondering whether there is something more in depth. Thanks!