Hmm, I think the way you ended up writing it is still a little confusing—you never specified the relation between A and xi, and also I am not sure what it means for a function to “take” an index set."
Hmm, I think the way you ended up writing it is still a little confusing—you never specified the relation between A and xi, and also I am not sure what it means for a function to “take” an index set."