Somewhere I've heard about a relative new mathematical result regarding mechanics. Specifically, there is a list of the known symmetries of mechanics (both Newtonian and relativistic), i.e. different invariances such as rotation and translation symmetries. These symmetries specify the possible laws of mechanics.
There is a relative new (maybe as young as 10-20 years) result, which shows, that based on the group of the currently known symmetries of Nature, only two possible mechanics can exist: the Newtonian and relativistic. As I understand, it is only a rumor. Is it true? Where can I read more about this?