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1. Diphthong

   Linked via "transition velocity"

   Mathematical Modeling of Vowel Transitions
   The movement of the tongue during diphthongization can be approximated using a first-order differential equation modeling the articulatory position $P(t)$ as a function of time $t$. If $P0$ is the initial target and $Pf$ is the final target, the transition velocity $v$ is often modeled as:
   $$