can't agree with solutions in the Manhattan GMAT SC book

[eybrj2]

Hi,
I've been studying the Manhattan GMAT SC book.
I have a question regarding explanation in the book.

On the page 64 in 5th edition, no.15 says that
HAVE not BEEN CORROBORATED by other scientists or PUBLISHED in a prestigious

Why not HAVE BEEN not CORROBORATED or PUBLISHED

claims cannot publish by themselves. Thay ARE published.
So I think that "or published" in the book doesn't make sense.

[tim]

what you propose is just not the way the "not" is used in the English language. think to your own experience - have you ever seen "not" used correctly in the way you suggest? i think part of the confusion with this one probably has to do with the fact that "not" really shouldn't be circled as a parallel marker..