Re: [tied] wre:g^, wro:g^ 'break'

Miguel:
Full grade *wreh1g^- > wre:g^-, o-grade (e.g. perfect) *wroh1g^- >
*wro:g^-. Zero grade *wr&1g^- > wrag^- (although in Greek one would
perhaps expect *wreg^-; the occurrence of rhag- here is an argument
for the traditional position that *&(1/2/3) all give *a, even in
Greek).

Rix is in line with Miguel and offers:
Full grade : aorist ?*wreh1g' Greek erre:xa
Zero grade : Present ?*wrh1g'-neu/nu Greek rhe:gnumi
Fientive ?*wrh1g'-eh1/h1 Greek up-errage:
o grade : Perfect *we-wroh1g' Greek erro:ge

The perfect should have gone *we-wro:g > we-iro:g > eiro:g, so the attested
form has been rebuilt. The perfect erre:cha also occurs.
The present apparently shows rh1 > re: instead of the more normal er (or
ere). According to Beekes (Development of the PIE Laryngeals in Greek)
there are other cases of this (as of rh3 > ro:).
The zero grade thus has two apparent outcomes here, one of which (re:) is
found elsewhere, and the other of which occurs only the aorist passive where
the -a- vowel is almost universal on forms that do not have the productive
suffix -the:n. For example:
di-ephthare:n etaphe:n eklape:n espare:n estale:n estraphe:n
esphale:n
etrape:n etraphe:n ephane:n echare:n
So I don't believe it is a purely phonetic development here. Analogy must
surely have played a part. Therefore Miguels' comment that &(1/2/3) all > a
in Greek cannot be supported from this evidence.

Peter