Tootfinder

"Tiling with Three Polygons is Undecidable"
Erik D. Demaine; Stefan Langerman 17 Sep 2024
Abstract
We prove that the following problem is co-RE-complete and thus undecidable: given three simple polygons, is there a tiling of the plane where every tile is an isometry of one of the three polygons (either allowing or forbidding reflections)? This result improves on the best previous construction which requires five polygons.
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It remains open whether tiling …

Crises affect activity demand differently, depending on the activity type and person.
In our new paper:
👉We divide the population into lifestyle typologies using Latent Cluster Analysis
👉A typology of activities covers possible interactions between crises and activities
👉Typologies of lifestyles and activity types provide a framework for forecasting
👉3 case studies are provided:
🦠COVID-19 pandemic
🥵heatwaves
⚡️energy
Preprint (without peer revie…

#Blakes7 Series D, Episode 08 - Games
TARRANT: Well not exactly. These things chuck the lot at you. Flying the real thing's nothing after one of these.
GAMBIT: Countdown eight minutes, still running.
https://blake…

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