I'll be the first person to win the Nobel Prize for something I wrote on X hamster. This is about: - Topological inversion (the inside-out transformation). When you do 1/x, you're turning the real line inside out around the 1D circle of 1 and -1. To me, that's the most important function in physics. - Pseudometrics (metric spaces with negative (or even null) distance, like the universe). - Null hypersurfaces (mainly, the null cone and event horizons). They exist in space but have no extent into the time dimension. That's why both those surfaces are flat. Thorne and Susskind are correct,… Read more
