9801/9800
| Ratio | 9801/9800 |
| Factorization | 2-3 × 34 × 5-2 × 7-2 × 112 |
| Monzo | [-3 4 -2 -2 2⟩ |
| Size in cents | 0.17664752¢ |
| Name | kalisma |
| Color name | 1oorrgg-2, Bilorugu comma |
| FJS name | [math]\text{M}{-2}^{11,11}_{5,5,7,7}[/math] |
| Special properties | square superparticular, reduced |
| Tenney height (log2 nd) | 26.5173 |
| Weil height (log2 max(n, d)) | 26.5174 |
| Wilson height (sopfr(nd)) | 64 |
| Harmonic entropy (Shannon, [math]\sqrt{nd}[/math]) |
~1.19851 bits |
| Comma size | unnoticeable |
| S-expressions | S99, S33 / S35 |
| open this interval in xen-calc | |
9801/9800, the kalisma, sometimes described as Gauss' comma, is an unnoticeable 11-limit comma measuring about 0.18 ¢. It is the smallest 11-limit superparticular interval.
It can be described as the difference between 99/98 and 100/99, and between 99/70 and its octave complement, 140/99. It is also the difference between 245/243 and 121/120, and a stack of two 11/7's and 81/80 against 5/2.
It factors into the two smallest 13-limit superparticular commas: 9801/9800 = (10648/10647)(123201/123200).
Temperaments
Tempering out this comma leads to the kalismic temperament, which splits the octave into two equal parts, each representing 99/70~140/99. Tempering it out also means that 10/9 and 11/7 are 1/2-octave apart, as well as are 11/10 and 14/9. Odd-numbered edos cannot temper it out. See Rank-4 temperament #Kalismic (9801/9800) for some technical details. See Kalismic temperaments for a collection of rank-3 temperaments where it is tempered out.
Etymology
This comma was named kalisma by Margo Schulter in 2000 from the Greek root kal- ("beautiful")[1]. Gene Ward Smith, not aware of Margo's work, proposed gaussisma in 2004, reasoning that D. H. Lehmer claimed Carl Friedrich Gauss had mentioned the ratio[2].