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【Read between lines】Hal Tasaki "Physics and mathematics of quantum many body systems" p. 496 (Problem 2.4.a: uniqueness in each M sector of ferromagnetic ground state via Perron-Frobenius theorem)
Key WordsPerron-Frobenius theorem A complete description of ground states for ferromagnetic system Relevant sectionIt suffices to show the uniqueness of ground state in each $${\mathscr{H}_M}$$ . This is easily done by applying the Perro