Skip to main content
2 events
when toggle format what by license comment
Feb 8, 2022 at 20:50 comment added Tim Campion There is always a canonical natural transformation; the condition that it be invertible is known as a Beck-Chevalley condition. There are a number of generic situations where it holds. Another relevant keyword is exact square (although on second thought the latter may not be so relevant to your situation).
Feb 8, 2022 at 15:40 history asked Igor Sikora CC BY-SA 4.0