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`BookProof.TwoParticleSector.swapDom_mem_corePow` {t : ((domSpace Hs D₂).pow 2).carrier} (ht : t ∈ corePow Hs D₂ D 2) : swapDom Hs D₂ t ∈ corePow Hs D₂ D 2 · Prove2Me