Muta cum liquida in the light of Tertenia Sardinian metathesis and compensatory lengthening Latin tr > Old French Vrr
This article is designed to show that muta cum liquida (branching onsets) enclose an empty nucleus (in case they are bipositional). Arguments come from two data sets. A compensatory lengthening is studied that has occurred in the evolution from Latin to Old French <i>within</i> a muta cum liquida: <i>tr dr</i> > <i>rr</i>, i.e., the loss of <i>t d</i> is accompanied by the gemination of <i>r</i> iff the preceding vowel is short (<i>petra</i> > <i>pierre</i> vs. <i>paatre</i> > <i>père</i>). In Tertenia Sardinian, it is argued that metathesis of <i>r</i> from the right to the left of the <i>o</i> in /sesø døormendu/ → <i>srø</i> <i>ðørɔmmέndu</i>; <i>ndu</i> (with ensuing gemination of the m on the position vacated) occurs in order to circumscribe the second of two empty nuclei (ø) in a row.