Colin Jahel

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20242026

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math.LO2025

When invariance implies exchangeability (and applications to invariant Keisler measures)

Samuel Braunfeld, Colin Jahel, Paolo Marimon

We study the problem of when, given a countable homogeneous structure $M$ and a space $S$ of expansions of $M$ , every $Aut (M)$ -invariant probability measure on $S$ is exch…

math.LO2024

Quasi-invariant measures concentrating on countable structures

Clinton Conley, Colin Jahel, Aristotelis Panagiotopoulos

Countable $L$ -structures $N$ whose isomorphism class supports a permutation invariant probability measure in the logic action have been characterized by Ackerma…