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...ert space H ′, the time development of the orthohydrogen spins is then governed by a Hamiltonian H that maps the triplet subspace into itself and annuls the singlet subspace: |dt〉 := (1 + iHdt) |0〉 . =-=(10)-=- We now develop an equivalent representation of the time development. The aim is to free the Hamiltonian from the mathematical conditions representing proton indistinguishability. We start from a symm...