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changed the statement 2018-05-19 55065f4
etale at x not X

Thanks to Fei Hu
https://stacks.math.columbia.edu/tag/0EA3#comment-3243
assigned tag 0EA3 2017-10-27 e062c42
Tags: Added new tags
changed the statement and the proof 2017-10-27 c427269
Fix up rough material from 668b977a

Just adding some references and clarifications
created statement with label lemma-key-purity-ramification in pione.tex 2017-10-27 668b977
Purity of Ramification Locus

Apparantly due to Gabber: see reference added.

Our writeup is different because we have less duality theory available.

Question: does somebody have a different/prior reference?
Even a reference for the case of varieties would be very welcome.