Sounds and Phonetic Systems

E-equivalence classes in the set usg₀ ^(ι) will be called sounds of the idiolect ι. The class of all sounds of ι will be symbolized by https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9780429466816/c51499bf-8d6f-413a-8894-096dbf3fef0c/content/pg85.tif"/>