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.
Find a 5-letter word in 1 minute!
Allenが制定した 3人麻雀の規則.
My policies regarding games and languages.
Allenが制定した 2人麻雀の規則. 1色と三元牌のみを用いる.
Multiplication table in any base from 2 to 20. / 任意の進数 (十進数, 十六進数, 二十進数 (廿進数) ほか) での「九九表」!
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.