Building on the talk by Sebastian Probst, we reconsider the Moran model with recombination, together with the ancestral process for the partitions of the set of sites, $\{1,\ldots,n\}$. We present a formal duality relation between the type distribution process forward in time and the partitioning process backward in time, where the joint probabilities of types at tuples of loci play the role of the duality function.
We prove this via the representation of the duality function in terms of recombinators, and with the help of various tools from discrete mathematics, in particular, the Moebius inversion principle.

Moran model; recombination; type distributions; duality