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Preprint Number 1915
1915. Erik Walsberg Notes on trace equivalence E-mail: Submission date: 28 January 2021 Abstract: We introduce trace definability, a weak notion of interpretability, and trace
equivalence, a weak notion of equivalence for first order structures and
theories. In particular we get an interesting weak equivalence notion for
\mathrm{NIP} theories. We describe a close connection to indiscernible
collapse. We also show that if Q is a divisible subgroup of (ℝ;+)
and Mathematics Subject Classification: Keywords and phrases: |

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