@ConradoCosta Well, the tag-excerpt explicitly says that "Typos and interpretation issues are also pertinent. " Although the tag seems to be a bit wider.

@ConradoCosta Since you are the tag-creator, you probably consider the tag useful. So it would be illogical if you were the one to delete tag.

My suggestion is simply to wait what other users say. (I have no doubt that if the tag is used, other users will notice it. And if somebody does not think that we should have that tag, they can start a discussion on meta.)

@barto That seems as a stretch to me.

I probably would not use the tag in this way.

I think it should be for questions about primality tests, i.e. various algorithms used for this purpose.

Only today I have noticed subspaces tag. With empty tag-wiki.

It is somewhat similar to quotient-spaces in the sense that it can be applied to various types of spaces. The quotient-spaces tag was previously discussed here: meta.math.stackexchange.com/questions/17531/…