This is a short way into a longer architecture. It does not replace the full derivation, and it does not try to; where the complete argument secures a step with a definition, a lemma, or a theorem, this text secures it only in prose and points beyond itself. What it offers instead is the spine — the single chain of necessities that runs from the bare idea of a determinate thing to a structural law governing what can persist, told so that each step is forced by the one before it. A crystal runs alongside the argument, entering only where a genuinely new structural feature has been reached, so that the reader can watch the abstract architecture and a real physical system develop in step. The law begins deeper than persistence. It first asks what determinate existence requires at all; persistence is the later moment, when such a determinate being is placed under real variation and the question becomes whether it carries through. The title names the law by its most general reach, but the derivation starts beneath even that — with the conditions under which there is anything determinate to persist in the first place.
Marc Maibom (Sun,) studied this question.
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