# Didymus rank three family

(Redirected from Didymus)

The didymus rank-3 family are rank-3 temperaments tempering out the didymus comma, 81/80. If nothing else is tempered out we have a 7-limit planar temperament, with an 11-limit comma we get an 11-limit temperament, and so forth.

Temperaments discussed elsewhere include:

## Didymus

Subgroup: 2.3.5.7

Comma list: 81/80

Mapping[1 0 -4 0], 0 1 4 0], 0 0 0 1]]

Optimal tuning (POTE): ~2 = 1\1, ~3/2 = 696.2387, ~7/4 = 964.9090

## Euterpe

Subgroup: 2.3.5.7.11

Comma list: 81/80, 99/98

Mapping[1 0 -4 0 1], 0 1 4 0 -2], 0 0 0 1 2]]

Optimal tuning (POTE): ~2 = 1\1, ~3/2 = 696.1982, ~7/4 = 968.4280

[[1 0 0 0 0, [1 0 1/4 0 0, [0 0 1 0 0, [0 0 0 1 0, [-1 0 -1/2 2 0]
Eigenmonzos (unchanged-intervals): 2, 5, 7

## Calliope

Subgroup: 2.3.5.7.11

Comma list: 45/44, 81/80

Mapping[1 0 -4 0 -6], 0 1 4 0 6], 0 0 0 1 0]]

Optimal tuning (POTE): ~2 = 1\1, ~3/2 = 696.1982, ~7/4 = 968.4280

[[1 0 0 0 0, [1 0 0 0 1/6, [0 0 0 0 2/3, [1 -1 0 1 1/6, [0 0 0 0 1]
Eigenmonzo (unchanged-interval) basis: 2.7/3.11

## Erato

Subgroup: 2.3.5.7.11

Comma list: 81/80, 126/125

Mapping[1 0 -4 -13 0], 0 1 4 10 0], 0 0 0 0 1]]

Optimal tuning (POTE): ~2 = 1\1, ~3/2 = 696.4949, ~11/8 = 547.0252

### 13-limit

Subgroup: 2.3.5.7.11.13

Comma list: 81/80, 105/104, 126/125

Mapping: [1 0 -4 -13 0 -20], 0 1 4 10 0 15], 0 0 0 0 1 0]]

Optimal tuning (POTE): ~2 = 1\1, ~3/2 = 695.9883, ~11/8 = 545.6817

## Clio

Subgroup: 2.3.5.7.11

Comma list: 81/80, 176/175

Mapping[1 0 -4 0 -12], 0 1 4 0 8], 0 0 0 1 1]]

Optimal tuning (POTE): ~2 = 1\1, ~3/2 = 697.2502, ~7/4 = 968.6295

[1 0 0 0 0, [1 0 1/4 0 0, [0 0 1 0 0, [0 0 0 1 0, [-4 0 2 1 0]
Eigenmonzos (unchanged-intervals): 2, 5, 7

## Polyhymnia

Subgroup: 2.3.5.7.11

Comma list: 81/80, 385/384

Mapping[1 0 -4 0 11], 0 1 4 0 -3], 0 0 0 1 -1]]

Optimal tuning (POTE): ~2 = 1\1, ~3/2 = 696.2305, ~7/4 = 964.8695

Scales: polyhymnia12

## Thalia

Subgroup: 2.3.5.7.11

Comma list: 33/32, 55/54

Mapping[1 0 -4 0 5], 0 1 4 0 -1], 0 0 0 1 0]]

Optimal tuning (POTE): ~2 = 1\1, ~3/2 = 692.0796, ~7/4 = 950.2565

## Melpomene

Subgroup: 2.3.5.7.11

Comma list: 81/80, 56/55

Mapping[1 0 -4 0 7], 0 1 4 0 -4], 0 0 0 1 1]]

Optimal tuning (POTE): ~2 = 1\1, ~3/2 = 699.2230, ~7/4 = 964.2363

## Terpsichore

Subgroup: 2.3.5.7.11

Comma list: 81/80, 540/539

Mapping[1 0 -4 0 -2], 0 1 4 0 7], 0 0 0 1 -2]]

Optimal tuning (POTE): ~2 = 1\1, ~3/2 = 696.2358, ~7/4 = 964.0006