Proof of the absence of local conserved quantities in the XYZ chain with a magnetic field. (arXiv:1803.02637v1 [cond-mat.stat-mech])

We rigorously prove that the spin-1/2 XYZ chain with a magnetic field has no
local conserved quantity. Any nontrivial conserved quantity of this model is a
sum of operators supported by contiguous sites with at least half of the entire

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