Moment duality and propagation of exchangeability

We identify necessary and sufficient conditions for a class of random mappings to send exchangeable $\{0,1\}$-sequences to other exchangeable $\{0,1\}$-sequences.

We call this property the propagation of exchangeability, and show that any mapping that propagates exchangeability induces a pair of forward- and backward-in-time processes that are moment duals.

This establishes a transparent, tractable, and applicable connection between moment duality and the propagation of exchangeability.

We illustrate the usefulness of our results by constructing lookdown models for $\Xi$-Fleming--Viot processes with frequency-dependent selection.