Parallel Axis Theorem Calculator implementation

Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

Record owner

Guth Instruments

Lifecycle

verified-clean

Evidence ID

t4-010

Effect

Computation or source lookup only

Input and validation requirements

An extreme but representable-looking input causes the plain JavaScript arithmetic to overflow A d² to Infinity. The calculator should reject or flag non-finite inputs and outputs. The specification has no denominator trap and no genuine formula regime switch.

Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

{
  "inputs": {
    "I_c": 200000,
    "A": 6000,
    "d": 50,
    "units": "mm⁴, mm², mm"
  },
  "expected_outputs": {
    "I": 15200000,
    "units": "mm⁴"
  },
  "working": "d² = 50² = 2,500 mm². Ad² = 6,000 × 2,500 = 15,000,000 mm⁴. I = I_c + Ad² = 200,000 + 15,000,000 = 15,200,000 mm⁴."
}

Other records

Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

• VERIFIED_LEDGER.json
• evidence-tranche4/tranche4-results.json