Well doesn't this look interesting: #MPSGöttingen's renowned dynamo experts Manfred Schüssler and Robert Cameron together with Paul Charbonneau, Masumi Dikpati, Hideyuki Hotta, Leonid Kitchatinov have edited the new Space Sciences series of ISSI #book
"Solar and Stellar Dy…
"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 …
Vaadi loppua kunniaan liittyvälle väkivallalle: allekirjoita vetoomus! #ihmisoikeudet https://ihmisoikeusliitto.fi/loppu-kunniaan-liittyvalle-vakivallalle/…
#Blakes7 Series C, Episode 10 - Ultraworld
CALLY: [V.O. still faint] Help me, please. I don't know where I am.
AVON: Cally, where are you? We need your location.
https://blake.torpidity.net/m/310/98
Rethinking Thanksgiving webinar starting in 10 minutes
https://www.mobilize.us/surj/event/727474/
Series C, Episode 05 - The Harvest of Kairos
TARRANT: The harvest week ended twelve hours ago. Whatever goes on down here is about to start.
DAYNA: If it hasn't started already.
https://blake.torpidity.net/m/305/432 B7B2