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      "statement": "# Haldane: nonlinear field theory of large-spin Heisenberg antiferromagnets\n\nMapped the low-energy large-spin one-dimensional antiferromagnetic chain to an O(3) nonlinear sigma model and distinguished integer from half-integer spin behavior.\n\n## Scientific scope\n\nThe record is Haldane's sole-author 1983 Physical Review Letters paper and its stated semiclassical regime. The earlier unpublished report, companion Physics Letters result, later numerical or experimental confirmation and all symmetry-protected-topological interpretations remain separate.\n\n## Reading status\n\nThis is a source-linked WRS catalogue note. A full explanatory guide and independent scientific reconstruction have not been completed for this entry. Read the identified original work for its complete narrative and arguments.\n\n## People and systems\n\nF. D. M. Haldane\n\nThe named authors contributed to this scoped work; individual effort shares and later applications are not assigned by the byline.\n\n\n\n## Original sources\n\n- [APS record for Haldane antiferromagnetic-chain paper](https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.50.1153)\n- [Haldane Nobel lecture on topological quantum matter](https://www.nobelprize.org/uploads/2018/06/haldane-lecture.pdf)\n",
      "summary": "Mapped the low-energy large-spin one-dimensional antiferromagnetic chain to an O(3) nonlinear sigma model and distinguished integer from half-integer spin behavior.",
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