When I look at questions which have this tag now (31 questions at the moment) or which were tagged with this tag in the past, it seems that people are using it for all sorts of stuff. (Basically anything where some kind of identity appears. To me it seems somewhat similar to the previously deleted (algebraic-identities) tag.)
The tag-info is a natural place where we could look for the intended use if this tag, but it is empty at the moment.
So I have basically two questions:
- Can this tag be useful? Should we keep it or should be removed?
- If we want to keep it, could at least the intended usage of the tag be clarified (and the tag-info edited accordingly)?