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Library / First Principles Framework (FPF) - Core Conceptual Specification
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A.19.CPM:1 - Problem frame

FPF’s Characterization (CHR) suite treats comparison as a distinct mechanism stage (compare) with suite‑wide obligations that forbid hidden scalarization or totalization, require tri‑state guards, and enforce admissibility declarations for numeric operations. Comparison must therefore be described as:

  • a mechanism (an operation declaration under A.6.1),
  • that is suite‑conformant (per CHR obligations and protocol closure in A.19.CHR),
  • and governing-spec-ref-respecting (comparability and admission are governed by CN-Spec and admissibility is gated by CG-Spec rather than re-invented locally).

Within suite protocols, CPM appears as the explicit compare stage: it consumes admitted left and right profiles, including scores and folded measures when those upstream stages are present, and produces an admissible, replayable comparison result that downstream selection can consume without CPM smuggling selection or scoring semantics into comparison.