IUPAC lowest-locant tiebreak framework: first-point-of-difference rule for locant-set comparison (P-14.5.2)

Layer 2 — Chemistryin the chemical-nomenclature subtree

The IUPAC lowest-locant tiebreak rule (Recommendations P-14.5.2): when two candidate numbering schemes produce locant sets of equal cardinality and equal sum, the tiebreak is decided by the first point of difference. Formalized as tuple…

Related concepts

IUPAC substitutive nomenclature: parent-chain + locants + suffix-priority
IUPAC locant tiebreak: {1,2,4} < {1,3,5} at first point of difference (2 < 3 at position 1)
Well-ordering theorem

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