Similar to 山登り法

Square root of 3

Four-dimensional space

Four fours

Five lemma

Five-dimensional space

Square root of 5

Square root of 6

Six-dimensional space

Square root of 7

Figure-eight knot (mathematics)

Nine lemma

One-form (differential geometry)

Partition of unity

Two-form

Twelfth root of two

Natural logarithm of 2

Sums of three cubes

Ages of Three Children puzzle

4-manifold

68–95–99.7 rule

6-j symbol

AB5 category

ABC@Home

Abc conjecture

Abramowitz and Stegun