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Public evidence

mechanical.statics.ladder_person

Machine-checked verification for calculation version 1.0.0 · tier engine_tested

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Verification

7/7 calculation tests · Production surface contract 6/6

  • Golden tests 3 / 3
  • Boundary tests 4 / 4
  • Property tests 0 / 0
  • Production surface contract 6 / 6
    • }
  • Engine tested Yes
  • Source checked Yes
  • Artifact integrity PASS
  • Production attestation Embedded snapshot: unpublished · Build schema 1.0.0 ready · Semantic contract ✓ · Attestation report not published on origin · Live production status STALE (6 capabilities; 189 remain CURRENT) @ 2026-09-23T14:00:05.385Z
  • Semantic contract PASS
  • Evidence attested at 2026-09-23T02:27:54.588Z
  • Last production check 2026-09-23T02:27:54.588Z
  • Public / cache —
  • Origin —
  • Supplemental domain review Not performed
  • Named expert review Not performed
  • release artifacts aligned PASS
  • schema output required declared PASS
  • schema valid input executes PASS
  • engine success output validates schema PASS
  • schema rejects incomplete input PASS
  • rest success payload validates schema PASS

Fingerprint sha256:42036c020a91f49e7b3ec8df8f916d20a2c3db9935de7d6e0d5c17ad5745864a

Input schema sha256:db2b24d8fe17961f7a466fd110cf565b3c2a8603d658421cdad3559c21fde7e7 · Output schema sha256:431838b6765f9c54a99afdf39b707cc534bae222a29f7311df855f34e08f578f · Build-time SHA-256 digests prove published artifacts agree with each other (release_integrity.scope=workspace). Production attestation GETs canonical URLs twice (public/cached view and origin), including Capability HTML, via npm run attest:production --write (published at /.well-known/calculatorx-production-attestation.json) and fails if the public Capability page advertises a different calculation_version. This is artifact consistency, not an independent immutable release log.

Build & scope

Engine identity and declared limitations.

Tool
ladder-person
Engine
ladder-person
Engine build
2026-09-23
Evidence core
2026-09-23T12:31:59.995Z
Rendered
2026-09-23T14:21:08.538Z
Last reviewed
—

Limitations

  • The ladder is uniform and its weight acts at mid-length
  • s is the fraction of the length from the floor toward the wall
  • Both surfaces are at impending slip
  • Not a wedge, a screw, or a belt

Sources

Standards and references supporting this tool specification. Methods are listed separately — they are algorithms, not bibliographic sources.

Published checks

Golden, boundary, and property cases included in this evidence build.

IDKindStatusDetail
golden-midgoldenpassExpected mode=climb · s=0.5 · N=200 · F=100 · B=100 · F_wall=0 · model=ladder_person · Actual model=ladder_person · W=100 · P=100 · theta_deg=45 · mu_floor=0.5 · mu_wall=0 · mode=climb · s=0.49999999999999983
golden-bothgoldenpassExpected mode=climb · s=0.44642857142857145 · N=267.85714285714283 · B=107.14285714285714 · F_wall=32.142857142857146 · Actual model=ladder_person · W=100 · P=200 · theta_deg=45 · mu_floor=0.4 · mu_wall=0.3 · mode=climb · s=0.44642857142949993
golden-topgoldenpassExpected mode=top · s=1 · s_limit=1.2320508075688772 · N=200 · B=100 · Actual model=ladder_person · W=100 · P=100 · theta_deg=60 · mu_floor=0.5 · mu_wall=0 · mode=top · s=1
boundary-weightboundarypassExpected VALUE_MUST_BE_POSITIVE · Actual VALUE_MUST_BE_POSITIVE
boundary-personboundarypassExpected VALUE_MUST_BE_POSITIVE · Actual VALUE_MUST_BE_POSITIVE
boundary-angleboundarypassExpected VALUE_OUT_OF_RANGE · Actual VALUE_OUT_OF_RANGE
boundary-floorboundarypassExpected VALUE_MUST_BE_POSITIVE · Actual VALUE_MUST_BE_POSITIVE