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Statements
1985
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phase transition
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\(C^*\)-algebra approach
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determination of all ground states of the XY-model on one-dimensional lattice
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external magnetic field strength
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solitons
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crossed product
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Pauli spin operators
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canonical anticommutation relations
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Jordan-Wigner transformation
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Fock ground states
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Hilbert-Schmidt norm
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\(Z_ 2\)-index
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