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when toggle format what by license comment
Sep 18, 2017 at 17:19 comment added Tobias Fritz This perfectly answers the question. I'd still be grateful for pointers to the literature where a proof may already have appeared.
Sep 18, 2017 at 17:18 vote accept Tobias Fritz
Sep 18, 2017 at 16:24 history answered Ilya Bogdanov CC BY-SA 3.0