{
  "statement": "H1: For every positive odd integer \\(\\ell\\), there exists \\(f_\\ell\\in\\mathbb Z[z]\\) such that\n\\[\nf_\\ell(s-s^{-1})f_\\ell(s^{-1}-s)\n\\equiv(-1)^{(\\ell-1)/2}\\frac{s^\\ell-s^{-\\ell}}{s-s^{-1}}\\pmod4.\n\\]\nThe quotient on the right is the Laurent polynomial\n\\(s^{\\ell-1}+s^{\\ell-3}+\\cdots+s^{1-\\ell}\\); the congruence is coefficientwise in \\((\\mathbb Z/4\\mathbb Z)[s^{\\pm1}]\\).\n\nProve H3: Let \\(L=K\\cup C\\subset S^3\\) be a smooth oriented two-component link with \\(C\\) unknotted and \\(\\operatorname{lk}(K,C)\\) odd. Let \\(\\pi:S^3\\to S^3\\) be the oriented double cover branched over \\(C\\), and give \\(K'=\\pi^{-1}(K)\\) and \\(C'=\\pi^{-1}(C)\\) the lifted orientations.\nThen \\(K'\\) is a knot and\n\\[\n\\Delta_{K'\\cup C'}(t,y^2)\\doteq\\Delta_{K\\cup C}(t,y)\\Delta_{K\\cup C}(t,-y).\n\\]\nThe variables \\(t,y\\) correspond to the knot and axis components, respectively. The two-variable Alexander polynomials are defined up to Laurent units; \\(\\doteq\\) means equality up to multiplication by \\(\\pm t^iy^j\\), \\(i,j\\in\\mathbb Z\\).",
  "starting_statement": "For every positive odd integer \\(\\ell\\), there exists \\(f_\\ell\\in\\mathbb Z[z]\\) such that\n\\[\nf_\\ell(s-s^{-1})f_\\ell(s^{-1}-s)\n\\equiv(-1)^{(\\ell-1)/2}\\frac{s^\\ell-s^{-\\ell}}{s-s^{-1}}\\pmod4.\n\\]\nThe quotient on the right is the Laurent polynomial\n\\(s^{\\ell-1}+s^{\\ell-3}+\\cdots+s^{1-\\ell}\\); the congruence is coefficientwise in \\((\\mathbb Z/4\\mathbb Z)[s^{\\pm1}]\\).",
  "target_statement": "Let \\(L=K\\cup C\\subset S^3\\) be a smooth oriented two-component link with \\(C\\) unknotted and \\(\\operatorname{lk}(K,C)\\) odd. Let \\(\\pi:S^3\\to S^3\\) be the oriented double cover branched over \\(C\\), and give \\(K'=\\pi^{-1}(K)\\) and \\(C'=\\pi^{-1}(C)\\) the lifted orientations.\nThen \\(K'\\) is a knot and\n\\[\n\\Delta_{K'\\cup C'}(t,y^2)\\doteq\\Delta_{K\\cup C}(t,y)\\Delta_{K\\cup C}(t,-y).\n\\]\nThe variables \\(t,y\\) correspond to the knot and axis components, respectively. The two-variable Alexander polynomials are defined up to Laurent units; \\(\\doteq\\) means equality up to multiplication by \\(\\pm t^iy^j\\), \\(i,j\\in\\mathbb Z\\).",
  "case_id": "KT-1-H1-to-H3",
  "given_context": {
    "premise": "For every positive odd integer \\(\\ell\\), there exists \\(f_\\ell\\in\\mathbb Z[z]\\) such that\n\\[\nf_\\ell(s-s^{-1})f_\\ell(s^{-1}-s)\n\\equiv(-1)^{(\\ell-1)/2}\\frac{s^\\ell-s^{-\\ell}}{s-s^{-1}}\\pmod4.\n\\]\nThe quotient on the right is the Laurent polynomial\n\\(s^{\\ell-1}+s^{\\ell-3}+\\cdots+s^{1-\\ell}\\); the congruence is coefficientwise in \\((\\mathbb Z/4\\mathbb Z)[s^{\\pm1}]\\)."
  },
  "protocol": "single"
}