10 basic regular quotient singularity types and
14 irregular quotient singularity types
| Singularity type | Index |
|---|---|
| [20] | 10 |
| [4, 3, 4] | 10 |
| [12, 2, 4] | 10 |
| [14, 2, 2] | 10 |
| [2, 2, 8, 2, 2] | 10 |
| [4, 2, 4, 2, 4] | 10 |
| [4, 2, 6, 2, 2] | 10 |
| [2, 3, 2, 2, 2, 2, 2] | 10 |
| [4, 3, 2, 2, 2, 2, 2, 2, 2] | 10 |
| [12, 2, 2, 2, 2, 2, 2, 2, 2] | 10 |
| [2, 2, 6, 2, 2, 2, 2, 2, 2, 2, 2] | 10 |
| [4, 2, 4, 2, 2, 2, 2, 2, 2, 2, 2] | 10 |
| [2, 2, 2, 2, 2, 2, 2, 3, 2, 2, 2, 2, 2, 2, 2] | 10 |
| [2, 2, 2, 2, 2, 2, 2, 2, 4, 2, 2, 2, 2, 2, 2, 2, 2] | 10 |
| Basic singularity type | Second singularity type | Third singularity type | Index |
|---|---|---|---|
| [11, 11] | [11, 2, 11] | [11, 2, 2, 11] | 10 |
| [11, 3, 2, 4] | [11, 2, 3, 2, 4] | [11, 2, 2, 3, 2, 4] | 10 |
| [11, 5, 2, 2] | [11, 2, 5, 2, 2] | [11, 2, 2, 5, 2, 2] | 10 |
| [2, 2, 5, 5, 2, 2] | [2, 2, 5, 2, 5, 2, 2] | [2, 2, 5, 2, 2, 5, 2, 2] | 10 |
| [4, 2, 3, 3, 2, 4] | [4, 2, 3, 2, 3, 2, 4] | [4, 2, 3, 2, 2, 3, 2, 4] | 10 |
| [4, 2, 3, 5, 2, 2] | [4, 2, 3, 2, 5, 2, 2] | [4, 2, 3, 2, 2, 5, 2, 2] | 10 |
| [11, 3, 2, 2, 2, 2, 2, 2, 2, 2] | [11, 2, 3, 2, 2, 2, 2, 2, 2, 2, 2] | [11, 2, 2, 3, 2, 2, 2, 2, 2, 2, 2, 2] | 10 |
| [2, 2, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2] | [2, 2, 5, 2, 3, 2, 2, 2, 2, 2, 2, 2, 2] | [2, 2, 5, 2, 2, 3, 2, 2, 2, 2, 2, 2, 2, 2] | 10 |
| [4, 2, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2] | [4, 2, 3, 2, 3, 2, 2, 2, 2, 2, 2, 2, 2] | [4, 2, 3, 2, 2, 3, 2, 2, 2, 2, 2, 2, 2, 2] | 10 |
| [2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2] | [2, 2, 2, 2, 2, 2, 2, 2, 3, 2, 3, 2, 2, 2, 2, 2, 2, 2, 2] | [2, 2, 2, 2, 2, 2, 2, 2, 3, 2, 2, 3, 2, 2, 2, 2, 2, 2, 2, 2] | 10 |
Reference: R. Blache, "Two aspects of log terminal surface singularities", Abh. Math. Sem. Univ. Hamburg 64 (1994), 59-87