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Aug 10, 2017 at 13:48 history edited Peter Heinig CC BY-SA 3.0
While not wrong, some parts of the answer were misleading, because of a hasty treatment of the special instance $r=3$. This has now been treated more clearly. Also, a very relevant and recent reference has been added to the thread.
Aug 9, 2017 at 14:03 history edited Peter Heinig CC BY-SA 3.0
Added a footnote and an explanation about Theorem 2 of loc. cit. having an additional hypothesis that I here gloss over.
Aug 9, 2017 at 9:47 history edited Peter Heinig CC BY-SA 3.0
Added one more paragraph trying to give an impression of Flapan's paper, again one which is relevant to the question in the OP.
Aug 9, 2017 at 9:03 history edited Peter Heinig CC BY-SA 3.0
Stylistic improvements.
Aug 9, 2017 at 8:15 history edited Peter Heinig CC BY-SA 3.0
Stylistic improvements.
Aug 9, 2017 at 8:06 history answered Peter Heinig CC BY-SA 3.0