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\section{Cooper \subsection{Cooper  Pairs} In superconductivity, electrons form Cooper Pairs. This is achieved not via direct interaction but through medium (lattice) mediation. A similar thing is happening in Jeremie's experiment: swimmers deplete the medium around them, leading to attractive interactions and clustering behaviour (section \ref{Clustering}).  There is a formalism for Cooper Pairs and many-body electron systems. Is this applicable in any way to interactions of active particles? Of course, all commutators are zero and there are no Fermi / Bose statistics; but it could be a new way of thinking about these things.