About Me

The author’s profile.

Basic 4D shapes

Introduction to 4D geometry.

Everything about Tesseract

Properties of the most famous 4D object.

Types of 4D shapes

Roughly categorize all shapes.

Regulars in 4D (Part 1)

The most symmetric 4D shapes. The smaller three.

Regulars in 4D (Part 2)

The larger three.

Stars in 4D

Pointy and starry shapes.

Semiregulars in 4D

Cousins of the regulars.

Dihedral and dichoral angles

Angles between shapes in 3D and 4D.

Infinite families

Shapes that exist throughout all dimensions

Hypersphere (Glome)

The shape of a 4D planet.

Word Riddle

Find a 5-letter word in 1 minute!

麻雀 標準規則

Allenが制定した 3人麻雀の規則.

Policy

My policies regarding games and languages.

Multiplication Table / 九九表

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」!

Various Tables

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.