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CVP reproduce

mechanical.statics.cantilever_moment_at_deflection

Independent re-run pack: fixed input vectors, O3 expected values, oracle version, commands, and the last result summary. This is how a reader moves from “CalculatorX says it passed” to “I can reproduce why it passed.”

Identity

Calculation version, protocol version, and evidence revision are distinct.

Calculation version
1.0.0
CVP protocol
1.0.0-proposed · proposed
Evidence revision
2026-09-27.o2-o3
Oracle
O3 · mpmath 1.4.1 · 80 dps
Generator
cantilever-moment-at-mpmath-o3 · seed 20260927.cantilever-moment-at-o3
Table SHA-256
567bbd2ed02469386658812244928a3b83e041cd616aa2758fb05fb7857fbf4b

Numerical claim

O3 PASS is a tabulated-vector claim, not a whole-domain proof.

O2: delta vs a separate-module identity (≤2 ULP). Not the tip under the same moment, and not a simply supported span. ≤2 ULP vs O3 applies only to the published tabulated cantilever-moment-at vectors.

  • Last O3 run 8 / 8
  • Max error observed 1 ULP
  • Threshold ≤ 2 ULP

Commands

Regenerate the table from the public generator. Independent REST check needs only this page's reproduce.json plus stdlib Python — no repo clone and no mpmath. The CVP runner remains a maintainer command.

Regenerate O3 table
python3 generate-cantilever-moment-at-o3.py after downloading the public generator next to the table
Repo maintainer path
python3 scripts/lib/cvp/oracles/generate-cantilever-moment-at-o3.py
Independent REST check
Compare POST /api/v1/calc/cantilever-moment-at against /developers/cvp/reproduce/cantilever-moment-at-o3-tables.json after downloading check-math-o3-rest.py next to cantilever-moment-at-o3-tables.json (or pass --reproduce reproduce.json)
Re-run CVP
npm run cvp:run -- --capability mechanical.statics.cantilever_moment_at_deflection
REST check
POST https://www.calculatorx.com/api/v1/calc/cantilever-moment-at with a tabulated input from the table below

Re-running the generator without changing seed or inputs should reproduce table SHA-256 567bbd2ed02469386658812244928a3b83e041cd616aa2758fb05fb7857fbf4b. Compare each expected_f64 to the production result within the declared ULP threshold.

Tabulated vectors

Every O3 vector used for the ≤2 ULP claim. Expected values come from the published mpmath table, not from the implementation under test.

IDKindInputsExpected (f64)ActualULPStatus
o3-checkcheck{"M":"4","a":"1","L":"2","E":"1","I":"1"}{"oracle_layer":"analytic","delta":2,"M":4,"a":1,"L":2,"E":1,"I":1}{"model":"cantilever_moment_at_deflection","M":4,"a":1,"L":2,"E":1,"I":1,"delta":2,"solver":"cantilever intermediate moment at the couple","convention":"Cantilever fixed at one end with one concentrated moment at distance a from the fixed end. The deflection at the moment is δ = M a²/(2 E I). Positive M is the positive deflection direction. I is an input. a = L is the tip-moment page. The free-end deflection when a < L is its own page."}0PASS
o3-SISI{"M":"1000","L":"2","E":"200e9","I":"1e-5","a":"1"}{"oracle_layer":"analytic","delta":0.00025,"M":1000,"a":1,"L":2,"E":200000000000,"I":0.00001}{"model":"cantilever_moment_at_deflection","M":1000,"a":1,"L":2,"E":200000000000,"I":0.00001,"delta":0.00024999999999999995,"solver":"cantilever intermediate moment at the couple","convention":"Cantilever fixed at one end with one concentrated moment at distance a from the fixed end. The deflection at the moment is δ = M a²/(2 E I). Positive M is the positive deflection direction. I is an input. a = L is the tip-moment page. The free-end deflection when a < L is its own page."}1PASS
o3-aliasalias{"moment":"8","span":"2","modulus":"1","Ix":"1","a":"1"}{"oracle_layer":"analytic","delta":4,"M":8,"a":1,"L":2,"E":1,"I":1}{"model":"cantilever_moment_at_deflection","M":8,"a":1,"L":2,"E":1,"I":1,"delta":4,"solver":"cantilever intermediate moment at the couple","convention":"Cantilever fixed at one end with one concentrated moment at distance a from the fixed end. The deflection at the moment is δ = M a²/(2 E I). Positive M is the positive deflection direction. I is an input. a = L is the tip-moment page. The free-end deflection when a < L is its own page."}0PASS
o3-awkwardawkward{"M":"13.7","a":"0.9","L":"2","E":"210000","I":"0.83"}{"oracle_layer":"analytic","delta":0.00003183304647160069,"M":13.7,"a":0.9,"L":2,"E":210000,"I":0.83}{"model":"cantilever_moment_at_deflection","M":13.7,"a":0.9,"L":2,"E":210000,"I":0.83,"delta":0.00003183304647160069,"solver":"cantilever intermediate moment at the couple","convention":"Cantilever fixed at one end with one concentrated moment at distance a from the fixed end. The deflection at the moment is δ = M a²/(2 E I). Positive M is the positive deflection direction. I is an input. a = L is the tip-moment page. The free-end deflection when a < L is its own page."}0PASS
o3-negsigned{"M":"-4","a":"1","L":"2","E":"1","I":"1"}{"oracle_layer":"analytic","delta":-2,"M":-4,"a":1,"L":2,"E":1,"I":1}{"model":"cantilever_moment_at_deflection","M":-4,"a":1,"L":2,"E":1,"I":1,"delta":-2,"solver":"cantilever intermediate moment at the couple","convention":"Cantilever fixed at one end with one concentrated moment at distance a from the fixed end. The deflection at the moment is δ = M a²/(2 E I). Positive M is the positive deflection direction. I is an input. a = L is the tip-moment page. The free-end deflection when a < L is its own page."}0PASS
o3-smallsmall{"M":"10","a":"0.5","L":"2","E":"1000","I":"0.01"}{"oracle_layer":"analytic","delta":0.125,"M":10,"a":0.5,"L":2,"E":1000,"I":0.01}{"model":"cantilever_moment_at_deflection","M":10,"a":0.5,"L":2,"E":1000,"I":0.01,"delta":0.125,"solver":"cantilever intermediate moment at the couple","convention":"Cantilever fixed at one end with one concentrated moment at distance a from the fixed end. The deflection at the moment is δ = M a²/(2 E I). Positive M is the positive deflection direction. I is an input. a = L is the tip-moment page. The free-end deflection when a < L is its own page."}0PASS
o3-stiffstiff{"M":"500","a":"1","L":"2","E":"210e9","I":"2e-4"}{"oracle_layer":"analytic","delta":0.0000059523809523809525,"M":500,"a":1,"L":2,"E":210000000000,"I":0.0002}{"model":"cantilever_moment_at_deflection","M":500,"a":1,"L":2,"E":210000000000,"I":0.0002,"delta":0.0000059523809523809525,"solver":"cantilever intermediate moment at the couple","convention":"Cantilever fixed at one end with one concentrated moment at distance a from the fixed end. The deflection at the moment is δ = M a²/(2 E I). Positive M is the positive deflection direction. I is an input. a = L is the tip-moment page. The free-end deflection when a < L is its own page."}0PASS
o3-longlong{"M":"200","a":"1","L":"4","E":"70e9","I":"5e-5"}{"oracle_layer":"analytic","delta":0.00002857142857142857,"M":200,"a":1,"L":4,"E":70000000000,"I":0.00005}{"model":"cantilever_moment_at_deflection","M":200,"a":1,"L":4,"E":70000000000,"I":0.00005,"delta":0.00002857142857142857,"solver":"cantilever intermediate moment at the couple","convention":"Cantilever fixed at one end with one concentrated moment at distance a from the fixed end. The deflection at the moment is δ = M a²/(2 E I). Positive M is the positive deflection direction. I is an input. a = L is the tip-moment page. The free-end deflection when a < L is its own page."}0PASS