ablaut function in IE

From: Rick McCallister
Message: 52981
Date: 2008-02-13

What was the function of ablaut?
Was it strictly to mark case (and number)? --as in
Greek, per the Wikipedia article on IE
If so, how did we get from there to word
differentiations e.g. German berg and burg < *bhregh-
(vel sim)?


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