The author’s profile.
Introduction to 4D geometry.
Properties of the most famous 4D object.
Roughly categorize all shapes.
The most symmetric 4D shapes. The smaller three.
The larger three.
Pointy and starry shapes.
Cousins of the regulars.
Angles between shapes in 3D and 4D.
Shapes that exist throughout all dimensions
The shape of a 4D planet.
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Allenが制定した 3人麻雀の規則.
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Tables that might be useful.
Allen wrote all articles. The content may be edgy. Allen will add or fix any content without notice.
Copyrighted by Allen Fischer. Established in Jun 2022.