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Examines curvature measurement methods, indicating optimal probe usage for second-Bianchi identifiability.
Translated infinitesimal loops measure the curvature first jet DR in the second‑Bianchi hook. Radial propagators are blind to all hook components. The derivative‑area operator has rank 6dimspan[P], requiring 20 independent hook probes. Four directions give 24 raw readings with four exact Bianchi redundancies. Tetrahedral null frame is condition‑optimal.
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Hiroyuki Shioiri (2026) studied this question.
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