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The requirement that capability does not diminish across mission cycles. ⚠️ It is NOT a weak/strong pair, and the source's naming of it as one was withdrawn: two independent axes cross here. Whether the guarantee is pathwise (deterministic) or in expectation (stochastic) is one axis; whether capability must merely hold (≥) or must rise (>) is the other. Calling the stochastic version 'strong' invites reading it as implying the deterministic one, and it does not — a system that usually gains and occasionally loses satisfies an expected increase and fails a pathwise non-decrease. The cells are targets for different domains: pathwise non-depletion where a single bad cycle is unrecoverable, stochastic accumulation where the institution absorbs a bad cycle and the trend is what matters. A system built for expected growth can be pathwise catastrophic.
A scientific laboratory satisfies non-depletion if its research throughput at the end of each equipment cycle equals or exceeds throughput at the start—capability is never silently degrading. Which cell it needs depends on whether a single lost cycle disperses the group.
Foundations of Regenerative Systems §3