2025/2024

Interval information

Ratio	2025/2024
Factorization	2-3 × 34 × 52 × 11-1 × 23-1
Monzo	[-3 4 2 0 -1 0 0 0 -1⟩
Size in cents	0.8551416¢
Name	fokkerisma
Color name	L23u1uyy-2, latwethuluyoyo negative 2nd, Latwethuluyoyo comma
FJS name	[math]\displaystyle{ \text{A1}^{5,5}_{11,23} }[/math]
Special properties	square superparticular, reduced
Tenney norm (log2 nd)	21.9667
Weil norm (log2 max(n, d))	21.9674
Wilson norm (sopfr(nd))	62
Comma size	unnoticeable
S-expression	S45
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Not to be confused with Fokker comma.

2025/2024, the fokkerisma is a 23-limit superparticular comma of 0.8551 cents. It is the amount by which a stack consisting of 9/8, 15/11 and 30/23 exceeds an octave, and forms the difference between 45/44 and 46/45. By tempering it out is defined the fokkerismic temperament, which enables the fokkerismic chords.

Etymology

The name fokkerisma was named by Xenllium in 2023, after Adriaan Daniël Fokker, a Dutch physicist and musician. Fokker led a revival of interest in 31-tone equal temperament (31edo), and invented the Fokker organ, a 31-tone equal-tempered organ. Rational intervals 45/44 and 46/45 were mapped to 1/31 of an octave (38.71¢, halfway between both ratios) in some EDOs of the 31n-edo family (such as 31edo and 217edo). Not to be confused with Fokker's comma (otherwise known as semicomma, 2109375/2097152, 10.06¢).

See also

• Unnoticeable comma
• List of superparticular intervals