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Jun 4, 2016 at 17:44 comment added Luc Guyot The original review's typo (or, at least, the not-so-common delta notation) is faithfully reproduced in the second to last line above. I. Reiner probably intended to say that $E_n(R)$ is a normal subgroup of $GE_n(R)$.
Apr 8, 2011 at 19:42 history edited Luis H Gallardo CC BY-SA 3.0
deleted 9016 characters in body; deleted 1532 characters in body
Apr 8, 2011 at 19:36 history answered Luis H Gallardo CC BY-SA 3.0