Source: https://guthlabs.ai/docs/instruments/pascal-s-triangle-explorer/implementation/

instrument implementation / implementation-contract

# Pascal's Triangle Explorer implementation

A source-bound implementation contract for Pascal's Triangle Explorer; 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**: t4-105

**Effect**: Computation or source lookup only

## Input and validation requirements

The row-count convention is unspecified, so input 3 can validly be interpreted as either three rows or rows 0 through 3. Negative row counts also require explicit rejection to avoid undefined generation.

## 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": {
    "number_of_rows": 0,
    "row_convention": "exactly R rows, zero-indexed"
  },
  "expected_outputs": {
    "triangle": [],
    "row_sums": [],
    "fibonacci_diagonal_sums": [],
    "powers_of_2_row_sums": []
  },
  "working": "R = 0, so there are no generated rows. No recurrence is evaluated, and all output sequences are empty."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/pascal-s-triangle-explorer/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/pascal-s-triangle-explorer/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/pascal-s-triangle-explorer/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-tranche4/tranche4-results.json`