CH. 02 · FORMAL METHOD · SLIDE 03
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§2.1

Working proposition

Proof by Invariants

Claims

State precedes velocity

We name the invariant first, then permit every implementation detail to move.

Each claim carries its witness

Benchmarks and counterexamples sit beside the proposition they support.

Notation remains local

A symbol is introduced once, scoped narrowly, and retired before review.

Review becomes refutation

Every merge asks for the smallest case that would falsify the result.