`BookProof.TwoParticleSector.swapH_involutive` (t : (Hs.pow 2).carrier) : swapH Hs (swapH Hs t) = t

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`BookProof.TwoParticleSector.swapH_involutive` (t : (Hs.pow 2).carrier) : swapH Hs (swapH Hs t) = t · Prove2Me