As pointed out by @swils in https://mattermost.mpi-sws.org/iris/pl/wzsucg5swtrttqhsawdd8pzama this lemma is missing
It's all the way down the file since I need properties of ∖. If someone knows a (short) proof without, we can move the property up, closer towards other properties on the order.
00:07:09
3 years ago
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