A $p$-adic variant of Kontsevich-Zagier integral operation rules and of Hrushovski-Kazhdan style motivic integration

Abstract

We prove that if two semi-algebraic subsets of ${\mathbb{Q}}_p^n$ have the same $p$-adic measure, then this equality can already be deduced using only some basic integral transformation rules. On the one hand, this can be considered as a positive answer to a $p$-adic analogue of a question asked by Kontsevich-Zagier in the reals (though the question in the reals is much harder). On the other hand, our result can also be considered as stating that over ${\mathbb{Q}}_p$, universal motivic integration (in the sense of Hrushovski-Kazhdan) is just $p$-adic integration.

17 pages