Wild ramification and K (π, 1 ) spaces
Wild ramification and K (π, 1 ) spaces
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野分叉和 K (π, 1 ) 空间
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发表时间:
2017
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通讯作者:
Piotr Achinger
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作者:
Piotr Achinger
We prove that every connected affine scheme of positive characteristic is a K (π, 1 ) space for the étale topology. The main ingredient is the special case of the affine space A kn over a field k . This is dealt with by induction on n , using a key “Bertini-type” statement regarding the wild ramification of (cid:3) -adic local systems on affine spaces, which might be of independent interest. Its proof uses in an essential way recent advances in higher ramification theory due to T. Saito. We also give rigid analytic and mixed characteristic versions of the main result.