Source: https://guthlabs.ai/docs/instruments/scientific-calculator/implementation/

instrument implementation / implementation-contract

# Scientific Calculator implementation

A source-bound implementation contract for Scientific Calculator; deployment and executable qualification remain separate.

Status: **VERIFIED_CLEAN**Lifecycle: **implementation-contract**

## 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**: t8-004

**Effect**: Computation or source lookup only

## Input and validation requirements

The division-by-zero vector produces Infinity at the numeric evaluator level even though the mathematical result is undefined, and the unspecified logarithm-base convention can produce either 4.605170185988091 or 2 for the same displayed expression.

## 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": {
    "expression": "sin(30) + sqrt(81)",
    "angle_mode": "DEG"
  },
  "expected_outputs": {
    "result": 9.5
  },
  "reference_data": {
    "identity": "sin(30 degrees)=1/2",
    "formula": "sin(30 degrees)+sqrt(81)"
  },
  "working": "30 degrees = 30*pi/180 = pi/6. sin(pi/6)=1/2=0.5. sqrt(81)=9. Add: 0.5+9=9.5."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/scientific-calculator/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/scientific-calculator/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/scientific-calculator/qualification/>)

## Sources and evidence

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

- `VERIFIED_LEDGER.json`

- `evidence-tranche8/tranche8-results.json`