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.