Some source which is to be trusted as having no mistakes, and present the work of Perelman on the Poincare question about the 2D ants walking in a plane which may be curved or not.
Ideally i would buy a book, but the books on that tend to cost upwards of 30 euros, so for the time being that is not an option
Ideally i would buy a book, but the books on that tend to cost upwards of 30 euros, so for the time being that is not an option