docs: D-HF honesty — public DHD still sees chords; fail() APEX not h=3 - #45
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Public DiscreteHausdorffDistance still sees chords except two locked pairs (single-arc CircularString → single-segment LineString; two circular discs; witness √949/6 − 7/6). Draft #14 over-claimed the opposite. Keep the full-TAG spec fail(); retire the stale h=3 text. Co-authored-by: Jeroen Bloemscheer <grootstebozewolf@users.noreply.github.com>
A single-member MultiSurface of one disc is circularDisc unwrap, not a third closed-form cell. Public DHD still sees chords in general. Co-authored-by: Jeroen Bloemscheer <grootstebozewolf@users.noreply.github.com>
Print the two-pair MAY sentence. Drop DiscreteFrechetDistance-as-D-HF shipped claim. fail() kept; stale h=3 stays retired. Co-authored-by: Jeroen Bloemscheer <grootstebozewolf@users.noreply.github.com>
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One short bullet per validated claim on feature/sfa-curve-rgr. D-HF from 0ca71b4, not #45. No Bar 2, no locationtech#1224/locationtech#1226. Co-authored-by: Jeroen Bloemscheer <grootstebozewolf@users.noreply.github.com>
This was referenced Aug 16, 2026
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Draft. MMF docs, not a merge. Base is
feature/sfa-curve-rgr(PR #7). Do not merge into #7 unless the PO says merge.This draft documents D-HF claims that already live on #7 @ 8e39e39 via 0ca71b. It is not SoT. Closed-form is two pairs only on #7. Not a SERE golden-run. Not new pairs. Do not import #45 as source. #14 is not a source.
What we may print
DiscreteHausdorffDistanceon #7 has closed-form for two pairs only:CircularString→ single-segmentLineString(apex √949/6 − 7/6 ≈ 3.967641)A single-member
MultiSurfaceof one disc is the same pair, not a third.Public DHD still sees chords in general. The locked pair is the exact path (
getGeometryType()); that path skips densify. Densify 0.05 is not the laser.test_D_HF_*fail()is kept. No Linearizable-on-construct.What we may not print
DirectedHausdorffDistance(Davis Mar 2026). That class already claims to replace Discrete. We did not invert that.isFullyWithinDistance, Linearizable-on-construct as shippedorientedDistance(segment, arc)as laserThis PR
EPIC_SFA_CURVE_AWARENESS.md§4.1 + Phase 3 D-HF (print-lock retip @9156544c)fail()text (exact path owns APEX; densify skipped, not the laser; stale h=3 retired)Notion board card and fieldnotes are not this PR. No blog post here.
Tip:
9156544ccdd56ddb341dee670be07eef115d22ca