# Uncovered Gap Derivation

> Reduce the candidate-gap set to the cells this unit can fail in, yielding the required-but-uncovered surfaces that still owe a test, so effort is spent on gaps that can fail rather than the full cartesian complement.

Record: `algorithms:uncovered-gap-derivation`
Kind: algorithm
Canonical: https://banes-lab.com/ontology/algorithms#algorithms-uncovered-gap-derivation
Closure: https://banes-lab.com/json/records/algorithms/uncovered-gap-derivation/closure

Listed in [Algorithm contracts](https://banes-lab.com/api/records/algorithms.md), after [Surface Grid Walk](https://banes-lab.com/records/algorithms/surface-grid-walk.md) and before [Coverage Risk Prioritization](https://banes-lab.com/records/algorithms/coverage-risk-prioritization.md).

## Domain

- [Test coverage](https://banes-lab.com/records/algorithms-domain/test-coverage.md)

## Stage

- [derive](https://banes-lab.com/records/stage/derive.md)

## Axis

- [reasoning](https://banes-lab.com/records/reasoning/axis-reasoning.md)

## Tier

- [process](https://banes-lab.com/records/vocabulary/domain-tier-process.md)

## Composed by

- [Test Coverage Kernel](https://banes-lab.com/records/algorithms/test-coverage-kernel.md)

## Named in the derivation of

- [Test Coverage Kernel](https://banes-lab.com/records/algorithms/test-coverage-kernel.md)

## Math type

- [Logic](https://banes-lab.com/records/reasoning/math-type-logic.md)

## Force

- [Correctness verification](https://banes-lab.com/records/force/correctness-verification.md)

## Linked from

- [A cell that resists an invariant](https://banes-lab.com/software-architecture/coverage/a-cell-that-resists-an-invariant.md)
- [Test coverage](https://banes-lab.com/ontology/algorithms/algorithms-domain-test-coverage.md)
- [The derivation loop](https://banes-lab.com/ontology/reasoning/reasoning-loop-derivation-loop.md)
- [The axes](https://banes-lab.com/ontology/reasoning/the-axes.md)
- [The mathematics](https://banes-lab.com/ontology/reasoning/the-mathematics.md)
- [Domain tiers](https://banes-lab.com/ontology/schema/the-vocabulary-domain-tier.md)
- [The forces](https://banes-lab.com/ontology/schema/the-forces.md)