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Jun 4, 2023 at 14:39 comment added mathematrucker Thank you for mentioning this good name for the pairs. It arises naturally and shows up in some recent papers. I changed "envelope" to the more available, more descriptive "extender" and will include "potential cover" in the definition.
Jun 4, 2023 at 13:36 vote accept mathematrucker
Jun 3, 2023 at 3:25 history undeleted Sam Hopkins
Jun 3, 2023 at 3:25 history edited Sam Hopkins CC BY-SA 4.0
I was wrong in the edit, they are potential covers.
Jun 3, 2023 at 3:18 history deleted Sam Hopkins via Vote
S Jun 3, 2023 at 3:17 history answered Sam Hopkins CC BY-SA 4.0
S Jun 3, 2023 at 3:17 history made wiki Post Made Community Wiki by Sam Hopkins