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Why is explanation valuable when a model proves unsatisfiable?

  • A.The model usually contains an error rather than the requirement
  • B.Explanations are required before the model may be published
  • C.The solver runs faster when explanations are requested
  • D.Unsatisfiability cannot be proved without an explanation

Answer: A

In practice a model reported as insoluble is far more often mis-stated than the real requirement is impossible, and a small conflicting subset points straight at the mistake. Without it a modeller faces hundreds of constraints and no clue. Publication, speed and provability are not the issue. A diagnostic that localises an error within a large artefact is worth more than any improvement in the speed of detecting that an error exists.

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