measure of prefix what is the measure of adding the prefixes a-1 and b-1 it seems you are adding a prefix to an infinite set, which shifts that set, hence the doubling of the original measure comes from this non-free move (adding the prefix) Reply
what is the measure of adding the prefixes a-1 and b-1
it seems you are adding a prefix to an infinite set, which shifts that set, hence the doubling of the original measure comes from this non-free move (adding the prefix)