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| Format: | Recurso digital |
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Zenodo
2026
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| Online-Zugang: | https://doi.org/10.5281/zenodo.19976946 |
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- <p></p> <p>A pebble rests in a shallow depression on a granite outcrop in the Australian outback. It has been there for ten thousand years. Rain has fallen on it. Wind has blown over it. The ground has trembled with distant earthquakes. The pebble has jiggled, rattled, and shifted—but it has never left its depression.</p> <p>Why?</p> <p>Because the depression is a <strong>container</strong>. Its walls rise just high enough that the random jostling of the world—a raindrop’s splash, a gust of wind, the tremor of a far-off quake—cannot lift the pebble over the rim. The pebble is free to move <em>within</em> its container, but it cannot escape without a push that exceeds the rim height. The container remembers the pebble’s rough position across geological time, not because it actively corrects the pebble’s location, but because its geometry passively rejects perturbations below a threshold.</p> <p>The principle the pebble embodies can be generalized and formalized into a framework for building computers whose memories endure through the geometry of their state space rather than through constant vigilance.</p> <p>The principle has a name: the <strong>threshold principle</strong>. The mathematics that underlies it is <strong>ultrametric geometry</strong>.</p>