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'Good' in the sense of being a fieldlie group. I think this is proven using K-theory. Other people here will have a lot more to say about that.

(EDIT: I'd just post this as a comment, but not enough reputation.)

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'Good' in the sense of being a field. I think this is proven using K-theory. Other people here will have a lot more to say about that.

(EDIT: I'd just post this as a comment, but not enough reputation.)