Spacetime structure

•This paper is about the “amount of structure” that different spacetimes posit.•Minkowski and Galilean spacetimes have incomparable amounts of structure.•But Newtonian spacetime has more structure than both.

This paper makes an observation about the “amount of structure” that different classical and relativistic spacetimes posit. The observation substantiates a suggestion made by Earman (1989) and yields a cautionary remark concerning the scope and applicability of structural parsimony principles.