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The architectural component that defines what must not change even as circumstances do—conditions that cannot be violated without undermining the system's legitimacy or integrity. Unlike rules, invariants are intentionally few and designed to survive scale and complexity.
A healthcare system might establish invariants: 'no patient is denied emergency care based on ability to pay' and 'clinical decisions are never subordinated to financial optimisation'—these hold regardless of context.
Pre-Gov Section 5.2