From: Miguel Carrasquer
Message: 40768
Date: 2005-09-27
>>What a/o Ablaut?
>> The full grade of the root is unremarkable if the word
>> contains etymological */a/, since the zero grade of */a/ is
>> */a/, as in *nas- obl. *nas-; *sal- obl. *sal-, etc. Since
>> these are acrostatic formations, we would expect Ablaut
>> *oN/*eN (*noNs-, obl. *neNs-), and apparently the reflexes
>> of *oN and *eN merged, Old-Polish-style, as **/aN/ (> */a/).
>>
>
>If you proposed instead *eN -> *aN -> *a, *oN -> *o, you could
>account for a/o ablaut.