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 …

[ May 2, 2025 - May 3, 2025] Conference or similar: 2025 Mountain-Pacific Meeting of the Society of Christian Philosophers https://philevents.org/event/show/129066

2025 Mountain-Pacific Meeting of the Society of Christian Philosophers
CFP: Religious Perspectives on the Good Life Paper Submissions We invite submissions on any topic in philosophy, with preference given to philosophy of religion, and very strong preference given to submissions that engage with the conference theme, broadly and globally construed. Please note the following submission guidelines:  Long abstracts (750-1000 words) are preferred. Full paper submissions of no more than 3000 words are also accepted. Please prepare your submission for anonymous revie…