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    "Currents are non-negative magnitudes",
    "Web UI is It+R1+R2 only",
    "API supported combinations: It+R1+R2, R1+R2+I1, R1+R2+I2, It+I1+R1, It+I1+R2",
    "It+I1+I2 is underdetermined → UNSUPPORTED_COMBINATION",
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    "It=0 and I1=0 with R1 or R2 is underdetermined → UNSUPPORTED_COMBINATION",
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    "R≤0 → VALUE_MUST_BE_POSITIVE",
    "It+I1+I2 → UNSUPPORTED_COMBINATION (underdetermined)",
    "It+I1+R inverse: I1=0 or I1=It → CURRENT_SPLIT_INVALID (no finite R>0)",
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      "title": "IEC 60050 — International Electrotechnical Vocabulary",
      "section": "Kirchhoff law for nodes (IEV 131-15-09)",
      "url": "https://www.electropedia.org/iev/iev.nsf/display?openform&ievref=131-15-09",
      "supports": "Algebraic sum of currents at a node is zero; I1 + I2 = It for two parallel branches",
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      "section": "Resistance (IEV 131-12-04)",
      "url": "https://www.electropedia.org/iev/iev.nsf/display?openform&ievref=131-12-04",
      "supports": "R = u/I on each branch; common node voltage V = I1·R1 = I2·R2",
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      "accessed": "2026-09-12",
      "clause": "IEV 131-12-04"
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      "title": "Horowitz & Hill — The Art of Electronics",
      "section": "3rd ed., Cambridge University Press, 2015 — Chapter 1 Foundations, current dividers",
      "supports": "Two-branch inverse-R current split",
      "kind": "reference",
      "publisher": "Cambridge University Press",
      "published": "2015"
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