Abstract
Let
Funding source: Australian Research Council
Award Identifier / Grant number: DP120104110
Award Identifier / Grant number: DP150103442
Funding statement: The author was partially supported by Australian Research Council grants DP120104110 and DP150103442.
Acknowledgements
We would like to thank Finnur Larusson for suggesting using de Jong’s alteration, which is very crucial in the treatment of this paper, to him and Erik Løw for helping with the presentation of the paper. We thank Keiji Oguiso for checking thoroughly several earlier versions of this paper, his interest in the results of the paper and constant encouragement in the course of this work. We would also like to thank Tien-Cuong Dinh, Hélène Esnault, Charles Favre, Mattias Jonsson, Pierre Milman and Claire Voisin for their invaluable help. The discussion with Nguyen-Bac Dang on his paper [8] was also very helpful. We are also grateful to many comments and suggestions of the referees, which helped improve the paper, in particular for pointing out a gap in the original proof of Lemma 4.1 and for suggesting Lemma 3.2.
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